gRPC Cloud Endpoints - 在API中接收auth结果

Question

Google云端点上的gRPC服务文档声明：

Receiving auth results in your API

Currently this feature is not supported for gRPC services: ESP 
does not pass any auth results (such as user email or ID) to gRPC backends.

拥有这些信息会非常方便，所以显而易见的问题是：这是一个有计划的功能吗？也许任何时间表？