Merge branch '3494404-add-data-from' into '2.0.x'

Resolve #3494404 "Add data from"

See merge request !300

src/Plugin/UiPatterns/PropType/VariantPropType.php

@@ -17,6 +17,7 @@ use Drupal\ui_patterns\PropTypePluginBase;
   label: new TranslatableMarkup('Variant'),
   description: new TranslatableMarkup('Prop type for component variants.'),
   default_source: 'select',
+  convert_from: ['string'],
   schema: ['type' => ['string'], 'enum' => []],
   priority: 1
 )]
@@ -36,4 +37,13 @@ class VariantPropType extends PropTypePluginBase {
     return static::normalizeEnumValue($value, $enum);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public static function convertFrom(string $prop_type, mixed $value): mixed {
+    return match ($prop_type) {
+      'string' => (string) $value,
+    };
+  }
+
 }