[otrs] ITSM Freetext Fields <-> Service/ Queues

Hello everyone, is it possible to have different Freetext fields for different services or queues? our customers will be using only the web interface to add tickets. so it would be very good if we could force them to enter a few details, like a serial number or a software version. but as we have different products and different customers, it would make sense if the required fields could be service or queue dependent. i was not able to figure out how to do this and by now i am no longer sure it is doable. any input is greatly appreciated! cheers, maurice