Provide a configuration entity type for quick form instances.

modules/core/quick/config/schema/farm_quick.data_types.schema.yml

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+# Quick form settings data type for quick form configuration entity.
+quick_form_settings:
+  type: mapping
+  label: 'Quick form settings'

modules/core/quick/config/schema/farm_quick.schema.yml

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+# Schema for quick form instance configuration entities.
+farm_quick.quick_form.*:
+  type: config_entity
+  label: 'Quick form instance'
+  mapping:
+    id:
+      type: string
+      label: 'Machine-readable name'
+    plugin:
+      type: string
+      label: 'Plugin'
+    label:
+      type: label
+      label: 'Label'
+    description:
+      type: text
+      label: 'Description'
+    helpText:
+      type: text
+      label: 'Help text'
+    settings:
+      type: farm_quick.settings.[%parent.plugin]
+
+farm_quick.settings.*:
+  type: quick_form_settings

modules/core/quick/src/Entity/QuickFormInstance.php

@@ -0,0 +1,153 @@
+<?php
+
+namespace Drupal\farm_quick\Entity;
+
+use Drupal\Core\Config\Entity\ConfigEntityBase;
+use Drupal\Core\Entity\EntityWithPluginCollectionInterface;
+use Drupal\farm_quick\QuickFormPluginCollection;
+
+/**
+ * Defines the quick form instance config entity.
+ *
+ * @ConfigEntityType(
+ *   id = "quick_form",
+ *   label = @Translation("Quick form"),
+ *   label_collection = @Translation("Quick forms"),
+ *   label_singular = @Translation("quick form"),
+ *   label_plural = @Translation("quick forms"),
+ *   label_count = @PluralTranslation(
+ *     singular = "@count quick form",
+ *     plural = "@count quick forms",
+ *   ),
+ *   handlers = {
+ *   },
+ *   entity_keys = {
+ *     "id" = "id",
+ *     "status" = "status"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "plugin",
+ *     "label",
+ *     "description",
+ *     "helpText",
+ *     "settings",
+ *   },
+ * )
+ */
+class QuickFormInstance extends ConfigEntityBase implements QuickFormInstanceInterface, EntityWithPluginCollectionInterface {
+
+  /**
+   * The ID of the quick form instance.
+   *
+   * @var string
+   */
+  protected $id;
+
+  /**
+   * The plugin instance ID.
+   *
+   * @var string
+   */
+  protected $plugin;
+
+  /**
+   * The plugin collection that holds the quick form plugin for this entity.
+   *
+   * @var \Drupal\farm_quick\QuickFormPluginCollection
+   */
+  protected $pluginCollection;
+
+  /**
+   * The quick form label.
+   *
+   * @var string
+   */
+  protected $label;
+
+  /**
+   * A brief description of the quick form.
+   *
+   * @var string
+   */
+  protected $description;
+
+  /**
+   * Help text for the quick form.
+   *
+   * @var string
+   */
+  protected $helpText;
+
+  /**
+   * The plugin instance settings.
+   *
+   * @var array
+   */
+  protected $settings = [];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getPlugin() {
+    return $this->getPluginCollection()->get($this->plugin);
+  }
+
+  /**
+   * Encapsulates the creation of the farm_quick's plugin collection.
+   *
+   * @return \Drupal\Component\Plugin\LazyPluginCollection
+   *   The block's plugin collection.
+   */
+  protected function getPluginCollection() {
+    if (!$this->pluginCollection) {
+      $this->pluginCollection = new QuickFormPluginCollection(\Drupal::service('plugin.manager.quick_form'), $this->plugin, $this->get('settings'), $this->id());
+    }
+    return $this->pluginCollection;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getPluginCollections() {
+    return [
+      'settings' => $this->getPluginCollection(),
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getPluginId() {
+    return $this->plugin;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getLabel() {
+    return $this->label ?? $this->getPlugin()->getLabel();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDescription() {
+    return $this->description ?? $this->getPlugin()->getDescription();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getHelpText() {
+    return $this->helpText ?? $this->getPlugin()->getHelpText();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getSettings() {
+    return $this->settings;
+  }
+
+}

modules/core/quick/src/Entity/QuickFormInstanceInterface.php

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+<?php
+
+namespace Drupal\farm_quick\Entity;
+
+use Drupal\Core\Config\Entity\ConfigEntityInterface;
+
+/**
+ * Provides an interface for defining quick form instance config entities.
+ */
+interface QuickFormInstanceInterface extends ConfigEntityInterface {
+
+  /**
+   * Returns the plugin instance.
+   *
+   * @return \Drupal\farm_quick\Plugin\QuickForm\QuickFormInterface
+   *   The plugin instance for this quick form.
+   */
+  public function getPlugin();
+
+  /**
+   * Returns the plugin ID.
+   *
+   * @return string
+   *   The plugin ID for this quick form.
+   */
+  public function getPluginId();
+
+  /**
+   * Returns the quick form label.
+   *
+   * @return string
+   *   The label for this quick form.
+   */
+  public function getLabel();
+
+  /**
+   * Returns the quick form description.
+   *
+   * @return string
+   *   The description for this quick form.
+   */
+  public function getDescription();
+
+  /**
+   * Returns the quick form help text.
+   *
+   * @return string
+   *   The help text for this quick form.
+   */
+  public function getHelpText();
+
+  /**
+   * Returns the quick form settings.
+   *
+   * @return array
+   *   An associative array of settings.
+   */
+  public function getSettings();
+
+}

modules/core/quick/src/QuickFormPluginCollection.php

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+<?php
+
+namespace Drupal\farm_quick;
+
+use Drupal\Component\Plugin\Exception\PluginException;
+use Drupal\Component\Plugin\PluginManagerInterface;
+use Drupal\Core\Plugin\DefaultSingleLazyPluginCollection;
+
+/**
+ * Provides a collection of quick form plugins.
+ */
+class QuickFormPluginCollection extends DefaultSingleLazyPluginCollection {
+
+  /**
+   * The quick form ID this plugin collection belongs to.
+   *
+   * @var string
+   */
+  protected $quickFormId;
+
+  /**
+   * Constructs a new QuickFormPluginCollection.
+   *
+   * @param \Drupal\Component\Plugin\PluginManagerInterface $manager
+   *   The manager to be used for instantiating plugins.
+   * @param string $instance_id
+   *   The ID of the plugin instance.
+   * @param array $configuration
+   *   An array of configuration.
+   * @param string $quick_form_id
+   *   The unique ID of the quick form entity using this plugin.
+   */
+  public function __construct(PluginManagerInterface $manager, $instance_id, array $configuration, $quick_form_id) {
+    parent::__construct($manager, $instance_id, $configuration);
+    $this->quickFormId = $quick_form_id;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function initializePlugin($instance_id) {
+    if (!$instance_id) {
+      throw new PluginException("The quick form '{$this->quickFormId}' did not specify a plugin.");
+    }
+    parent::initializePlugin($instance_id);
+  }
+
+}