How to set up approval rules for a specific employee?

Summary:

I need to set up approval for rules for a few specific employees that will route differently than everyone else. Is there a way to do this? I don't see an option for preparer username or email.

Content (required):

FinExmWorkflowExpenseApproval

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):