How to use the jsii._kernel.types.BeginRequest function in jsii

def ainvoke(
        self, obj: Referenceable, method: str, args: Optional[List[Any]] = None
    ) -> Any:
        if args is None:
            args = []

        promise = self.provider.begin(
            BeginRequest(
                objref=obj.__jsii_ref__,
                method=method,
                args=_make_reference_for_native(self, args),
            )
        )
        if isinstance(promise, Callback):
            promise = _callback_till_result(self, promise, BeginResponse)

        callbacks = self.provider.callbacks(CallbacksRequest()).callbacks
        while callbacks:
            for callback in callbacks:
                try:
                    result = _handle_callback(self, callback)
                except Exception as exc:
                    # TODO: Maybe we want to print the whole traceback here?
                    complete = self.provider.complete(

SetRequest, _with_api_key("set", self._serializer.unstructure_attrs_asdict)
        )
        self._serializer.register_unstructure_hook(
            StaticSetRequest,
            _with_api_key("sset", self._serializer.unstructure_attrs_asdict),
        )
        self._serializer.register_unstructure_hook(
            InvokeRequest,
            _with_api_key("invoke", self._serializer.unstructure_attrs_asdict),
        )
        self._serializer.register_unstructure_hook(
            StaticInvokeRequest,
            _with_api_key("sinvoke", self._serializer.unstructure_attrs_asdict),
        )
        self._serializer.register_unstructure_hook(
            BeginRequest,
            _with_api_key("begin", self._serializer.unstructure_attrs_asdict),
        )
        self._serializer.register_unstructure_hook(
            EndRequest, _with_api_key("end", self._serializer.unstructure_attrs_asdict)
        )
        self._serializer.register_unstructure_hook(
            CallbacksRequest,
            _with_api_key("callbacks", self._serializer.unstructure_attrs_asdict),
        )
        self._serializer.register_unstructure_hook(
            CompleteRequest,
            _with_api_key("complete", self._serializer.unstructure_attrs_asdict),
        )
        self._serializer.register_unstructure_hook(
            StatsRequest,
            _with_api_key("stats", self._serializer.unstructure_attrs_asdict),