Make an OpenVPN gateway through SOCKS5

[silvio]

Hello,
I am trying to have the following chain:

- some device connected on the LAN interface sends a packet destined to the internet
- the packet is routed through an OpenVPN interface in Opnsense
- the OpenVPN connexion is routed through a Socks5 proxy

I was able to achieve that on Windows and Linux. I don't see any parameters allowing me to that in the WebUI of OpnSense in VPN->OpenVPN->Instances->Add.
Is there another way to achieve my goal ? did I miss something ?
Regards