Make HipChat `room` property use a template so the room can be chosen dynamically

Kapacitor communicates with UDFs via protocol buffers over STDIN/STDOUT (Kapacitor spawns a child process), or through a socket where the UDF runs externally. When data is emitted back to Kapacitor from the UDF, as a point, simply add the field "myNewValue" to the point that is passed back.

The question is...how to pass the value to property methods that don't accept templates (hipchat room in this example)?