Hide or make worksheet column field greyed out based on condition

Summary:

I need to hide or make worksheet field greyed out based on condition.

The worksheet has a component which is for exceptional performer employees.

Amount : Compensation amount -component 1 column is holding this value which is user enterable.

Justification: Also, a text column is defined in user defined columns for capturing justification for the above compensation amount - component 1 column.

For terminated employees compensation worksheet displays terminated employee row. The Compensation amount -component 1 column is greyed out and justification column is user enterable.

I tried role based overrides for Justification column by override setting - read only and assigning roles in the list.