How to use the jsonargparse.ActionJsonnet function in jsonargparse

def save_paths(cfg, base=None):
                replace_keys = {}
                for key, val in cfg.items():
                    kbase = key if base is None else base+'.'+key
                    if isinstance(val, dict):
                        if '__path__' in val:
                            val_path = Path(os.path.join(dirname, os.path.basename(val['__path__']())), mode='fc')
                            if not overwrite and os.path.isfile(val_path()):
                                raise ValueError('Refusing to overwrite existing file: '+val_path)
                            action = _find_action(self, kbase)
                            if isinstance(action, ActionParser):
                                replace_keys[key] = val_path
                                action._parser.save(val, val_path(), branch=action.dest, **save_kwargs)
                            elif isinstance(action, (ActionJsonSchema, ActionJsonnet)):
                                replace_keys[key] = val_path
                                val_out = strip_meta(val)
                                if format == 'json_indented' or isinstance(action, ActionJsonnet):
                                    val_str = json.dumps(val_out, indent=2, sort_keys=True)
                                elif format == 'yaml':
                                    val_str = yaml.dump(val_out, default_flow_style=False, allow_unicode=True)
                                elif format == 'json':
                                    val_str = json.dumps(val_out, sort_keys=True)
                                with open(val_path(), 'w') as f:
                                    f.write(val_str)
                            else:
                                save_paths(val, kbase)
                        else:
                            save_paths(val, kbase)
                for key, val in replace_keys.items():
                    cfg[key] = os.path.basename(val())

def __call__(self, *args, **kwargs):
        """Parses an argument as jsonnet using ext_vars if defined.

        Raises:
            TypeError: If the argument is not valid.
        """
        if len(args) == 0:
            kwargs['_ext_vars'] = self._ext_vars
            kwargs['_validator'] = self._validator
            if 'help' in kwargs and '%s' in kwargs['help'] and self._validator is not None:
                kwargs['help'] = kwargs['help'] % json.dumps(self._validator.schema, indent=2, sort_keys=True)
            return ActionJsonnet(**kwargs)
        setattr(args[1], self.dest, self._check_type(args[2], cfg=args[1]))

replace_keys = {}
                for key, val in cfg.items():
                    kbase = key if base is None else base+'.'+key
                    if isinstance(val, dict):
                        if '__path__' in val:
                            val_path = Path(os.path.join(dirname, os.path.basename(val['__path__']())), mode='fc')
                            if not overwrite and os.path.isfile(val_path()):
                                raise ValueError('Refusing to overwrite existing file: '+val_path)
                            action = _find_action(self, kbase)
                            if isinstance(action, ActionParser):
                                replace_keys[key] = val_path
                                action._parser.save(val, val_path(), branch=action.dest, **save_kwargs)
                            elif isinstance(action, (ActionJsonSchema, ActionJsonnet)):
                                replace_keys[key] = val_path
                                val_out = strip_meta(val)
                                if format == 'json_indented' or isinstance(action, ActionJsonnet):
                                    val_str = json.dumps(val_out, indent=2, sort_keys=True)
                                elif format == 'yaml':
                                    val_str = yaml.dump(val_out, default_flow_style=False, allow_unicode=True)
                                elif format == 'json':
                                    val_str = json.dumps(val_out, sort_keys=True)
                                with open(val_path(), 'w') as f:
                                    f.write(val_str)
                            else:
                                save_paths(val, kbase)
                        else:
                            save_paths(val, kbase)
                for key, val in replace_keys.items():
                    cfg[key] = os.path.basename(val())