If you're up for it I'd suggest that you make a pull request to the gadgetbridge repo. The more of us that know how to add/tweak functionality there the better in my opinion.
I've done a couple myself with no previous knowledge before that - I'd be happy to try and help with any question you'd have. And the maintainers of gadgetbridge are helpful when they have the time.
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.
If you're up for it I'd suggest that you make a pull request to the gadgetbridge repo. The more of us that know how to add/tweak functionality there the better in my opinion.
I've done a couple myself with no previous knowledge before that - I'd be happy to try and help with any question you'd have. And the maintainers of gadgetbridge are helpful when they have the time.