code: def set_mecab_fstring(cls, token: UserDataProto, fstring: str):
      token.user_data[cls.KEY_FSTRING] = fstring
  
file_path: camphr/packages/camphr/camphr/tokenizer/mecab/__init__.py
imports: from camphr.doc import Doc, UserDataProto
  from typing import List, NamedTuple, TYPE_CHECKING
  from camphr.serde import SerDe
  from typing_extensions import Literal, Protocol
label_desc: Use image node_id 2 for calling the Tokenizer obj's underlying member method code with example usage: obj.set_mecab_fstring(cls, token, fstring) without return types