code: def _add_metadata(field):
      if "description" not in field:
          field["description"] = None
  
      if "info" not in field:
          field["info"] = None
  
      for _field in field.get("fields", []):
          _add_metadata(_field)
  
label_desc: Use image node_id 3 for calling a global function with example usage: _add_metadata(field) without return types