Is it possible to add an existing employee as a contact during a New Hire process?

Summary:

Content (please ensure you mask any confidential information):

When a hire an employee/contigent worker using my client groups - add a contingent worker/Hire a Person. We also add the contact to the Employee.

The client wants to know if we can add an existing employee as a contact in the Contact section during New Hire process?

I checked the personalization and found no option to do that. Is it possible to run a duplicate check for contacts just like we do for Employees using first name/last name/DOB ?

Version (include the version you are using, if applicable):