openfed-8.x-8.5/modules/openfed_features/openfed_administration/openfed_administration.links.menu.yml

entity.media.collection:
  title: 'Embeddables'
  parent: system.admin_content
  description: 'Find and manage embeddables.'
  route_name: view.media.media_page_list

entity.media.add:
  title: 'Add a new embeddable'
  parent: entity.media.collection
  description: 'Add a new embeddable entity.'
  route_name: entity.media.add_page