Two ISP WAN Connections

Hello everyone. I have a working 81E FG with WAN1 already in use. I recently purchased another connection and need to connect that to WAN2 but I need all 5G wifi users to use WAN1 and 2.4G Wifi users to use WAN2.

I do not need any sort of backup between the two isp’s.

Note: Cannot implement SD-WAN. I was hoping to achieve the above using Policy Routing.