Per user bandwidth from captive portal connection

Hello everyone. I am a new user to IPFire and while I’m not inept regarding networking, this also is not a field I “live” in therefore there are significant gaps in my understanding.

I have set up IPFire as a captive portal for a guest network. Here is my question: Is it possible to designate bandwidth per user? I’m slightly familiar with QoS but only in terms of one type of traffic vs. another. Is it possible to say this new user has X amount of upload/download reserved for them?

Thanks in advance for your help.