Dual WAN setup, wan1 through hotspot, wan2 ignores hotspot

My client decided to get another internet connection for their internal network and wants to leave the first one for the hotspot users.

So it goes something like this

WAN1 => 192.168.1.0/24 => hotspot => internet
WAN2 => 192.168.2.0/24 => internet (skips the hotspot).

I don’t want any load balancing, fail-over or anything else.