connectivity matrix of density-group analysis

Hello Mrtrix experts,

I recently come across this amazing toolbox for DTI structural connectivity analysis (surely, I am a novice to mrtrix software). I preprocessed my DWI data in a cloud computing platform called brainlife ( through the mrtrix3 pipeline. We have generated whole-brain tractograms by combining ensemble tractography with anatomically-constrained
tractography (ACT) and from whole-brain tractograms, we computed the streamline
density between each region and generated our structural connectivity matrices.
Now I have correlation files (structural connectivity matrices) for each subject (schizophrenia and healthy volunteers) in .csv format.

The query is that how to do group-level analysis using structural connectivity matrices in mrtrix3?

Any assistance would be highly appreciated!