term_reference_fancytree-8.x-2.0-rc1/term_reference_fancytree.routing.yml

term_reference_fancytree.subTree:
  path: '/term_reference_fancytree/subTree'
  defaults:
    _controller: '\Drupal\term_reference_fancytree\Controller\SubTreeController::json'
    _title: 'Sub Tree'
  requirements:
    _permission: 'access content'