code: def init_job(
      self, channel_id: str, user_id: Optional[int]
  ) -> dict[str, Any]:
      job_id = str(uuid.uuid4())
      return build_job_metadata(
          channel_id, job_id, user_id, status=self.STATUS_PENDING
      )
  
imports: import json
  import logging
  import uuid
  from typing import Any, Literal, Optional
  import jwt
  import redis
  from flask import Flask, request, Request, Response, session
  from superset.utils.core import get_user_id
label_desc: Use image node_id 5 for calling the AsyncQueryManager obj's underlying member method code with example usage: obj.init_job(channel_id, user_id) and returns: build_job_metadata