site_structure.settings:
  type: config_object
  label: 'Site Structure settings'
  mapping:
    allowed_parent_targets:
      type: sequence
      label: 'Allowed parent targets'
      sequence:
        type: mapping
        mapping:
          entity_type:
            type: string
            label: 'Entity type'
          bundle:
            type: string
            label: 'Bundle'