form_mode_manager-8.x-1.x-dev/modules/form_mode_user_roles_assign/form_mode_user_roles_assign.routing.yml

form_mode_manager.admin_settings_roles_assign:
  path: '/admin/config/content/form_mode_manager/role-assign'
  defaults:
    _form: 'Drupal\form_mode_user_roles_assign\Form\FormModeManagerRolesForm'
    _title: 'Form Mode Manager settings Roles assign'
  requirements:
    _permission: 'administer site configuration'
  options:
    _admin_route: TRUE