Mwan3 specific site to specific wan

Hi,
I install and configure mwan3 on my router.
It works.
Now I have a problem:
I use two WAN one is xDSL and one 3G/4G.
the 3G/4G connection is not open to all protocol and sites over internet so I want mwan3 use balancing from the two WAN just if the protocol or site is accessible by the two WAN and if the protocol or site is not accessible by the 3G/4G WAN then use just the xDSL.
Is there any way to do this?

Thanks

I am not really sure if automatc switching is available in any package but for manual specific routing you can use luci-app-vpn-policy-routing. Search the forum for it.

Ok thanks I will try