Good idea, I've asked for it too, yet the only way H2H arenas are in any way connected to HTC's servers is through the H2H lobby. Our game sends a signal to their server giving them periodic updates of how many people are in our servers, what the server name is, and our ping.
Yet we're not connected to HTC servers so that they can get direct information from users inside our arenas. The only way this would work is if the host's computer logged this information, and then he sent it off to the people requesting it.