BTH_01 battery voltage adjustable

[ExploWare]

First: thanks for your work.
The advice with the bad battery management of this specific device did make me rethink it and modify the powersource:
I have a rechargeable outdoor PIR light with a decent LiPo battery.
This 3.7v (avg) is apparently not a problem, it's been working for a while without issues.
Now, the firmware reports a battery level in Volts and in Percents.
This percentage is calculated to the 2x AAA level. This of course is no longer valid.
So, my question/feature requeat:
Would there be a feasible way to have this adjustable over Bluetooth or perhaps have a second branch of firmware releases? (I assume this is produced easily by CI/CD? That part I could assist)

Thanks for reading this