Ar300m openvpn over shadowsocks

Anyone tried the tunnel the openvpn over shadowsocks on the ar300m? I looked a guide here, How to tunnel ExpressVPN over Shadowsocks | Tips for China, but can’t figure out how to do this on openwrt/ar300m

First configure ss as local proxy. Then setup openvpn to use the proxy.

Sorry I cannot help more. But I believe it is doable. Trying and testing is your friend.