use a specific wan port for a local ip address

i have usg60 device which have wan1 connected to a 5g router(with ip 192.168.1.85 and wan2 connected to a fiber router (with ip 192.168.0.85). the network is connected to lan1 with ip 192.168.2.85.

in the configuration we have load balance and failover and a VPN L2TP-ipsec. the question is: how i can force a specific local ip address of the network (192.168.2.x) to connect to the internet only via wan2?