storybook-1.x-dev/storybook.routing.yml

storybook.render_story:
  path: /storybook/stories/render/{hash}
  defaults:
    _controller: '\Drupal\storybook\Controller\ServerController::renderStory'
    _title: "Render a Storybook story"
  requirements:
    _custom_access: '\Drupal\storybook\Controller\ServerController::access'
  options:
    _no_big_pipe: TRUE