Downloading the health data into Gadgetbridge directly is definitely something that can be done, and someone else asked just last week I believe. I just needs a little bit of work done on Gadgetbridge to enable it (I believe there's just an unimplemented function).
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.
Downloading the health data into Gadgetbridge directly is definitely something that can be done, and someone else asked just last week I believe. I just needs a little bit of work done on Gadgetbridge to enable it (I believe there's just an unimplemented function).