https://gallery.technet.microsoft.com/projectserver/Use-SharePoint-people-cc8289de
Project Server PDPs (Project Detail Pages) have the facility to host Project level enterprise custom fields for users to edit.
Out-of-the-box Project Server supports Cost, Date, Duration, Flag, Number and Text - but not fields of type Person.
With the supplied Javascript, you can transform any 'Single Line Of Text' field into a SharePoint people picker.
