It is impossible to add middlware to HttpClientBuilder

let middleware = RpcServiceBuilder::new()
        .rpc_logger(1024)
        .layer_fn(|service| MyMiddleware {
            service,
            count: std::sync::Arc::new(tokio::sync::Mutex::new(0)),
        });
let client = HttpClientBuilder::default()
            .set_rpc_middleware(middleware)
            .build(url);

It turned out that client does not have a type of HttpClient which is actually HttpClient<RpcLogger<http_client::rpc_service::RpcService<_>>>
But instead it has a type HttpClient<RpcLogger<MyMiddleware<http_client::rpc_service::RpcService<_>>>>
which I can not define anywhere (as a function return type) because http_client::rpc_service::RpcService is private. The struct itself is public but the module is private so I can't just return client from function or use it as a struct property.