How to pass request context to GRPC Go endpoints from Ruby

I'm calling GRPC endpoints from Ruby.

The proto endpoints are for example rpc SayHello (HelloRequest) returns (HelloReply), and implemented in Go, so they take context when calling from Go. The generated client supports client.SayHello(ctx context.Context, request *HelloRequest).

However when calling from Ruby it's just client.SayHello(request), where request's type is HelloRequest. How do I pass in the context? I want to do this because the Go endpoint implementations use the context in a variety of ways such as logging.