flag_lists-4.0.x-dev/flag_lists.links.action.yml

entity.flagging_collection.add_form:
  route_name: entity.flagging_collection.add_page
  title: 'Add Flagging collection'
  appears_on:
    - entity.flagging_collection.collection

entity.flagging_collection_type.add_form:
  route_name: entity.flagging_collection_type.add_form
  title: 'Add Flagging collection type'
  appears_on:
    - entity.flagging_collection_type.collection