merci-8.x-2.x-dev/modules/merci_line_item/merci_line_item.links.action.yml

entity.merci_line_item.add_form:
  route_name: 'entity.merci_line_item.add_page'
  title: 'Add Merci Line Item'
  appears_on:
    - entity.merci_line_item.collection
entity.merci_line_item_type.add_form:
  route_name: 'entity.merci_line_item_type.add_form'
  title: 'Add Merci Line Item type'
  appears_on:
    - entity.merci_line_item_type.collection