Capturing headers from http/2 trailers?

[Patrick Hemmer]

Is there a way to capture (and log) headers from http/2 response 
trailers? The documentation doesn't mention trailers, and when I try to 
reference headers which are present in the trailers (e.g. 
"res.fhdr(grpc-status)"), it doesn't get captured.

At the end of the day I'm trying to log the grpc-status and grpc-message 
headers from gRPC responses.

Thanks

-Patrick