code: def getvalue(self):
      return json.dumps(self._val)
  
imports: import contextlib
  import functools
  import json
  import os
  import re
  import click
  from click import shell_completion
  import guild
  from guild import python_util
label_desc: Use image node_id 10 for calling the JSONHelpFormatter obj's underlying member method code with example usage: obj.getvalue() and returns: json