@robin-ecn The only thing you need to figure out is the scaling factor between the normalized thrust and the acceleration. This is hardwawre dependent on what kind of mootrs / voltage you are using.
A good guess can be made with the hover throttle. For example, if your drone hovers at a normalized thrust value of 0.5, that means the normalized thrust value of 0.5 is going to be close to accelration value of 9.8m/s^2.
This way, the normalized thrust values can be mapped to the actual acceleration.