Hi @AMAN SHAIKH,
Thank you for posting in this community.
First of all, JSON format and conditional column both control the display of this column based on the values of other columns, but not based on the logged-in user.
Second, the minimum level of permissions set in SharePoint is the item (which is a row in a List), and there are no permissions set for columns.
I'm sorry SharePoint doesn't have a way to hide certain columns based on the user at the moment.
Thank you for your kind understanding.
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