class_docstr: Juman tokenizer
  
  Note:
      `spacy.Token._.fstring` is set. The Juman's output is stored into it during tokenizing.
class_docstr_tok: ["Juman","tokenizer","Note",":","`","spacy.Token._.fstring","`","is","set",".","The","Juman","'s","output","is","stored","into","it","during","tokenizing","."]
code: def set_juman_fstring(cls, e: UserDataProto, fstring: str):
      e.user_data[cls.KEY_FSTRING] = fstring
  
imports: from dataclasses import dataclass
  from camphr.doc import Doc, UserDataProto
  import itertools
  import distutils.spawn
  from typing import Any, Callable, Dict, Iterator, List, Optional
  from typing_extensions import Literal
  from camphr.serde import SerializationMixin
label_desc: Use image node_id 2 for calling the Tokenizer obj's underlying member method code with example usage: obj.set_juman_fstring(cls, e, fstring) without return types