Hiding Grade information in the Summary of Changes field

Summary:

We're implementing compensation and grades. Salary and grade are very sensitive data and must be accessed only by specific Compensation&Benefits Representatives. We need to hide/remove any the "Grade" specific change records in "What Changed" part of Employment Info > Employment History > Summary of Changes page, this grade change information should only appear in the specified roles and must be excluded from all other roles. This cannot be achieved in HCM design studio or Page Composer. What can be the way to remove it. Is there a specific privilege that affects the Grade Changes to be rendered or not rendered