gyro sensor in bangle.js?

Sat 2021.03.06

While not an exact gyroscope sensor, there are the accelerometer and magnetometer:

http://www.espruino.com/Bangle.js+Techni­cal

Granted, it may not be exactly what you are seeking:

https://electronics.stackexchange.com/qu­estions/36589/what-are-the-differences-b­etween-a-gyroscope-accelerometer-and-mag­netometer#:~:text=They%20are%20three%20s­ensors%20that,A%20magnetometer%20measure­s%20magnetic%20fields.&text=A%20gyroscop­e%20measures%20either%20changes,rotation­al%20velocity%20(rate%20gyro).

but the 'Acceleration Logger' app might suit your needs:

https://banglejs.com/apps/

xyz accel function reference:

https://banglejs.com/reference#l_Bangle_­accel

Exactly what task solution is being attempted?