Greeting to queue members or whisper message?

I was wondering if I can add a greeting or what we call internally a “whisper message” on call queues for our internal intake team to hear before a caller connects to them?

I see I can add a greeting prompt for the caller to hear but we are looking for the opposite. I pose this question because the marketing team is trying to differentiate sources coming in for certain cases. My suggestion was to mark each call queue name with abbreviation for case type. 

Does anyone have any ideas or suggestions?