Onboarding Forms - User editing Employee Fields - Dual Signature

Summary

How can I get the User to be able to edit Employee Fields on Dual Signature Forms?

Content

I want manager to be able to verify and edit Employee merge fields such as Pay Rate, Department, etc. However, in my Dual form, it only allows the User to edit User merge fields. Is there a way to have the Employee Fields be available for merge fields on the Onboarding forms?