Fluid Forms and Approval - CI to Add a New Role to a User?

Hello,

I am experimenting with the new Fluid Forms and Approval Builder feature. I am currently testing a Form that takes one we have today (just an Excel-based template) where a manager is requesting a new Role be added to their employee (ex: Role to edit journals in GL). I have fields on my Form for the employee's OPRID and the Role names they can select from. The form would add a single Role to the employee upon completion of the approval process.

Is it possible to create a CI that would update the User ID with the newly requested role, if approved? The Peoplebooks page discussing integrating Forms with CI mapping mentions it can only be used to add new records. I wasn't sure if something like the USER_PROFILE delivered CI could be used as a base or not.