[otrs] Postmaster Filter Question

I have a number of filters in place that route tickets to corresponding queues. What I would like to also do is assign a particular agent to tickets coming into OTRS that are routed to a specified queue. In the "Set" header area for the "PostMaster Filter" feature there is a choice for a queue labeled X-OTRS-queue. This works great. But there is no X-OTRS-Agent specification. There are a number of X-OTRS-Ticketkey headings. Can I use one of these? Please advise. M. Wallace