Use widget string for name media-folder in image widget

Hi,

I would like to use fields.folder for create folder in fields.image_gallery.

I try with below code, but dont work Failed to load entry: "params.mediaFolder" is not allowed to be empty

Are you a suggestion ?
Thanks

      - label: "Gallerie"
        name: "gallery"
        widget: "object"
        fields:
          - { label: "Dossier", name: "folder", widget: "string" }
          - label: "Images Gallerie"
            name: "image_gallery"
            widget: "image"
            choose_url: false
            media_folder: "{{field.folder}}/"
            allow_multiple: true
            media_library:
              config:
                multiple: true

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