docs: def update_jupytext_formats_metadata(metadata, new_format):
      """Update the jupytext_format metadata in the Jupyter notebook"""
      new_format = long_form_one_format(new_format)
      formats = long_form_multiple_formats(metadata.get('jupytext', {}).get('formats', ''))
      if not formats:
          return
  
      for fmt in formats:
          if identical_format_path(fmt, new_format):
              fmt['format_name'] = new_format.get('format_name')
              break
  
      metadata.setdefault('jupytext', {})['formats'] = short_form_multiple_formats(formats)