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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
I'm not sure if Gadgetbridge provides the functionality (although you could do a PR to add it).
If you don't want to write any code for the phone, you could also look at
Tasker- this is an automation app for Android.At https://www.espruino.com/Gadgetbridge under
Android -> Banglewe show an example of how you can get Tasker to send a command to Bangle.js, so assuming Tasker can get your battery percentage (which I bet it can) you're sorted