code: def add_subparser(parser):
      """Add the subparser that needs to be used for this command"""
      serve_parser = parser.add_parser(
          "frontend", help=DESCRIPTION, description=DESCRIPTION
      )
  
      serve_parser.add_argument(
          "-p",
          "--port",
          type=int,
          default=3000,
          help="port to run frontend (default 3000)",
      )
  
      serve_parser.add_argument(
          "-b",
          "--backend",
          type=str,
          default="http://127.0.0.1:8000",
          help="backend address (default: http://127.0.0.1:8000)",
      )
  
      serve_parser.set_defaults(func=main)
  
      return serve_parser
  
file_path: orion/src/orion/core/cli/frontend.py
imports: import logging
  import mimetypes
  import os
  import site
  import sys
  import falcon
  from gunicorn.app.base import BaseApplication
label_desc: Use image node_id 2 for calling a global function with example usage: add_subparser(parser) and returns: serve_parser