code: def _metavar_formatter(self, action, default_metavar):
      if action.metavar is not None:
          result = action.metavar
      elif action.choices is not None:
          if len(action.choices) > 4:
              choice_strs = ", ".join(
                  [str(c) for c in action.choices][:4]
              )
              result = f"{{{choice_strs} ... {len(action.choices) - 4} more choices}}"
          else:
              choice_strs = ", ".join([str(c) for c in action.choices])
              result = f"{{{choice_strs}}}"
      else:
          result = default_metavar
  
      def formatter(tuple_size):
          if isinstance(result, tuple):
              return result
          else:
              return (result,) * tuple_size
  
      return formatter
  
imports: import argparse
  import os
  from typing import Tuple
  from jina.enums import ProtocolType
  from jina.logging.predefined import default_logger
label_desc: Use image node_id 6 for calling the _ColoredHelpFormatter obj's underlying member method code with example usage: obj._metavar_formatter(action, default_metavar) and returns: formatter, result, unknown