Is there a way to add Requester to a Payables > Manage Description Rules?

We have a requirement to add the Requester to the journal entry description via the Task = Manage Description Rules. Unfortunately, I am not able to find the Requester value listed when defining the description rule. Is Requester NOT available to use or is it listed under some non-sensical value. I've looked for Invoice Requester, Requester, requester_id and have NOT been able to find. Please advise. Thanks.