How to build smart nav PPOC field into Case Management

Summary:

Is there anyway I can build the Smart Nav Primary Point of Contact feature in into Case Management. It currently sits in the HR Help Desk form (see attachments) but I believe my client would find it much more useful in the Case Management form as they would like to be able to access Document of records easily.

Content (please ensure you mask any confidential information):

In visual builder it is labelled with a special Smart Nav functionality but in Case Management it does not have this. Will I need to configure something in App Composer? or is it not possible?