Reading acceleration on the Bangle.js

Hi there,
For a project with the Bangle.js, I need to read the acceleration-sensor. I was able to achieve this with

Bangle.on('accel', function(xyz) { ... });

However, this doesn't really measure the acceleration, but the tilt of the watch. Is it possible to read the raw values from the accelerometer, so that it would be possible, for example, to measure how fast a car is accelerating?

Thanks in advance