sector-8.x-2.0-alpha4/config/install/ds.field.media_extension.yml

id: media_extension
label: 'Media extension'
ui_limit: ''
properties:
  content:
    value: "[media:field_document:entity:extension]\r\n[media:image:entity:extension]"
    format: teaser_display_text
type: token
type_label: 'Token field'
entities:
  media: media