Coordinates in MNI space to subject space

Hello MRtrix experts,

I followed the steps proposed by @mblesac to coregister tck files in MNI space and it works very well !! (Thank you for the helpful forum !!)
I get coordinates (x,y,z) in MNI space, how can I get the corresponding coordinates in the native space of my subject ?
If anyone has insight on what to do it would be much appreciated !

Thanks for reading,