CRM 2016 Opportunity Close Description Required

We have a business requirement to change the requirement level on the opportunity close form description field. As this field has managed properties on it OOTB I do not see a way to do so through the GUI. I also do not see a way to write a workflow, business rule or add JavaScript to this form/field in order to change the requirement level. Is there a way to accomplish this requirement?

Thanks ~ Jenn