Hi David
MR on its own may not be able to do so.
However it can segregate traffic as @vassallon suggested by tagging the SSID to appropriate VLAN.
Once the traffic is segregated your gateway appliance shall route the subnets to desired WAN interfaces.
If you are using MX as your gateway appliance
Security & SDWAN->SD-WAN & traffic shaping may help you to do so.
Regards,
Ajit
AjitsNW@gmail.com
www.ajit.network