Learning Approval Flow

Hi,

I am trying to create Learning Assignment withdrawal approval rule based on who is withdrawing it, If Learner withdrew then it should go for Manager for approval and if Manager withdrew then it should be auto approved. I couldn't find a field within approval rules which stores information about who withdrew. I can see Withdrawal Reason Code and Comment attributes but I cannot use them to distinguish whether it is manager or employee who withdrew. Is there anyway I can write approval rule based on who is withdrawing?

Thanks