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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
Interesting - you could definitely show recorded tracks in Gadgetbridge, that might be neat.
Regarding:
You could make Bangle.js advertise as a standard Bluetooth HRM device (as @AnotherStranger showed in https://forum.espruino.com/comments/17004362/), and then yes that should work fine - but whether it would work at the same time as Gadgetbridge I'm not sure!