old_contents: def _jupyter_nbextension_paths():
      return [{
          'src': 'amd',
          'dest': 'jupyter-tree-filter',
          'require': 'jupyter-tree-filter/index'
      }]
  
new_contents: def _jupyter_nbextension_paths():
      return [{
          'section': 'tree',
          'src': 'amd',
          'dest': 'jupyter-tree-filter',
          'require': 'jupyter-tree-filter/index'
      }]
  
subject: Add section