rc-1.0.x-dev/modules/rc_group/rc_group.routing.yml

rc_group.chat_groups_settings:
  path: '/admin/rc/chat_groups_settings'
  defaults:
    _form: '\Drupal\rc_group\Form\GroupsChatSettingsForm'
    _title: 'Groups chat settings'
  requirements:
    _permission: 'manage rocket chat settings'
  options:
    _admin_route: TRUE