Make it possible to alter the edit link

src/Plugin/Field/FieldWidget/ImageCanvasEditorWidget.php

@@ -135,6 +135,8 @@ class ImageCanvasEditorWidget extends ImageWidget {
         ],
         '#access' => \Drupal::currentUser()->hasPermission('use image canvas editors'),
       ];
+      \Drupal::moduleHandler()
+        ->alter('image_canvas_editor_api_edit_link', $link);
       $element['edit'] = $link;
     }
     return $element;