Set source priorities per device

[tvr256]

I have 2 GPS devices attached to SignalK, each of them outputs 13 SignalK fields (position, COG, SOG etc).

Currently there is no way to set one device as the default (or higher priority) device in SignalK. I can go into "Server / Data Connections / Source Priorities Settings", but then I need to assign priorities for all 13 fields separately.

Could per-device priorities be added to SignalK?

Simple use case : if Maiana is powered on, I want to use its internal GPS since this is up on the pushpit. Otherwise I want to automatically fall back to the USB dongle in the cabin.