opnsense + unifi usg

[TaceN]

Hey guys,

I've got a working installation of mac and connected through a VPN client to ExpressVPN.
I've also got a Unifi USG.

I would like to route specific devices over VPN, Through the opnsense installation.

I've got it connected like this.

CPE
 - Port 1: Unifi USG
 - Port 2: Opnsense

Unifi USG
 - WAN1 - CPE port 1
 - WAN2 - interface (network card 2, USB) opnsens

Is it even possible to route traffic through the devices connected like this?

Thanks

 / T