groupmenu-8.x-1.0-beta2/groupmenu.links.action.yml

group_relationship.group_menu_relate_page:
  route_name: 'entity.group_relationship.group_menu_relate_page'
  title: 'Relate menu'
  appears_on:
    - 'entity.group.menu'

group_relationship.group_menu_add_page:
  route_name: 'entity.group_relationship.group_menu_add_page'
  title: 'Create menu'
  appears_on:
    - 'entity.group.menu'