Limit View of Seniority dates to Full Time staff only

We are currently looking at making Seniority Dates available for Employees to view. However, we only want them to be visible for full-time staff and not part-time. Is anyone aware of a way we could get this to work? EL expressions I believe are just used for roles and specific users. We would want it to look at at Collective agreement to determine if the employee is full-time or part time.

If they are full-time, we would like them to be able to view seniority dates on the employment info page.

Thanks,

Becky