video_embed_field-8.x-2.4/modules/video_embed_wysiwyg/video_embed_wysiwyg.ckeditor5.yml

video_embed_wysiwyg_video_embed:
  provider: video_embed_wysiwyg
  ckeditor5:
    plugins:
      - videoEmbed.VideoEmbed
  drupal:
    label: Video Embed WYSIWYG
    library: video_embed_wysiwyg/video_embed
    admin_library: video_embed_wysiwyg/admin.video_embed
    toolbar_items:
      videoEmbed:
        label: Video embed
    elements:
      - <iframe>
      - <iframe width height frameborder allowfullscreen title loading src>
    conditions:
      filter: video_embed_wysiwyg
    class: Drupal\video_embed_wysiwyg\Plugin\CKEditor5Plugin\VideoEmbedWysiwyg