Hi, you can achive this with Managermanager.
It is installed by default (I think), you can find the documentation in this folder : assets/plugins/managermanager/docs
You should have a chunk called
mm_demo_rules, open it and add something like this
mm_hideFields('content', '1', '3'); // Hide the content field for users with role "1" editing documents using template ID "3"
Alternatively, you can create a new tab, still using Managermanager