I want to delete an image of textarea in site.yml

I have attached an image to textarea in site.yml.
But how can I delete the image I have uploaded once?
If possible I would like to be able to do it in the backend like album.yml.

  - width: 1/3
    sections:
      badnewdays:
        type: fields
        fields:
          videodes:
            type: textarea
            buttons: true
          caption:
            type: structure
            fields:
              cap:
                type: textarea
                buttons: true

To be able to delete image, you need a files section. Deleting files is not possible via the textarea field.

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