Is there a way for an employee to enter a person number for an emergency contact?

Summary:

Is there a way for an employee to enter a person number for an emergency contact instead of automatically assigning the emergency contact a person number?

Content (required):

We want the employee to enter the emergency contact's national ID as their person number, instead of a random number the system assigns - is that possible?

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

Code Snippet (add any code snippets that support your topic, if applicable):