[Freesurfer] retinotopy_receptive fields_ STIM PARAMETER

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Dear experts, I am performing some study on visual receptive fields (using retinotopy stimuli) and have already run the -recon-all command and it worked fine. After that, I cut the occipital poles (left and right) and flattenend the results. So, now I have the flat patches images.

I would like to use the retinotopy parameter file (now is a .mat file) in freesurfer (I found that should be something like a .par format? I don't know so well this format), so that would be possible for me to read it on freesurfer and proceed further on pipeline. How to achieve this step?

Sorry if the question may results confusing. Thank you for your help, Marco