Default enrollment formula

Summary

Asking if a formula can be developed that defaults enrollments in a plan that employee had previously enrolled in.

Content

Partial load employees in our org have contract start and end as per semester. So employees who are enrolled in benefits would have their contract ended when the semester ends resulting in ending of benefit elections. When they come back for another semester in 3 weeks after the Winter break they have a new contract for which a new hire life event is triggered. Can a formula be developed for default enrollments on this new hire life event that brings back the enrollments in benefits they had during their last contract?