Zend certified PHP/Magento developer

OpenWRT: routing lan client with static IP to custom VPN interface

On a OpenWRT router (OpenWrt 22.03.5) I’ve created a custom interface to connect with my Wireguard external server (WG0). It seems to work fine according to regular handshakes. There is a device connected to the router by LAN interface with static IP (f.e. 192.168.99.123). I need to route all the device’s traffic through WG0 interface instead of regular default WAN interface. Is there any relatively simple way to do it? LuCI methods preferred