docs: def json(**kwargs):
      """
      Adds the specified data to the the output display window with the
      specified key. This allows the user to make available arbitrary
      JSON-compatible data to the display for runtime use.
  
      :param kwargs:
          Each keyword argument is added to the CD.data object with the
          specified key and value.
      """
      r = _get_report()
      r.append_body(render.json(**kwargs))
      r.stdout_interceptor.write_source(
          '{}\n'.format(_json_io.dumps(kwargs, indent=2))
      )