def METHOD_NAME(cls) -> List[argparse.ArgumentParser]:
    """@brief Add this subcommand to the subparsers object."""
    json_parser = argparse.ArgumentParser(description=cls.HELP, add_help=False)
    json_options = json_parser.add_argument_group('json output')
    json_options.add_argument('-p', '--probes', action='store_true',
        help="List available probes.")
    json_options.add_argument('-t', '--targets', action='store_true',
        help="List all known targets.")
    json_options.add_argument('-b', '--boards', action='store_true',
        help="List all known boards.")
    json_options.add_argument('-f', '--features', action='store_true',
        help="List available features and options.")
    return [cls.CommonOptions.CONFIG, json_parser]