Exposing voltage measurement when connected to 12vDC

[almonde]

I have a Shelly1 connected to my driveway gate opener, it's using the closed contact sensor option and configured as a garage door. Would be great if there was an option to expose the voltage of the battery powering the Shelly. I have a Shelly25 in the garage being used for some lights, its has the power option and I can see the power when the lights are on, but would be nice to have a a way of exposing the voltage when used in a DC system for battery monitoring. Would save me having to open up my gate opener cabinet to check the voltage on the solar controller or battery itself.

I know exposing this to HomeKit would not be possible as a direct voltage, but would be cool to configure a minimum voltage in the config to activate the 'battery low' icon in apple Home.