RVR315 battery level data field on Edge 850?

The RVR315 does not have a light and l the light battery level data field on Edge 850 does not display the 315 battery level.

On Edge 830 and others, the Connect IQ data field 'Varia Radar Battery' works perfectly. The developer has not updated that data field since October 2024 and Edge 850 and other newer units remain incompatible. 

Is there any way to show RVR315 battery level in a data field on Edge 850?  The battery level can be checked under sensors but that's impracticable to monitor battery level during an activity. 

Thanks