Is it possible to pull in the Role Field in Fusion?

I have a rather complex Fusion that assigns approval flows on requests based on managerial relationships, departments, and $ amounts in Workfront. At times, I need to write in exceptions using JSON code, however, there appears to be no way to narrow down individuals based on roles in either JSON or just the regular interface, so I have to hard code it by User ID in JSON--which is, of course, not the most sustainable. Am I missing something here? Or do I need to request that Workfront make the User Role field available over API for Fusion?

Thanks!