Is it possible to separate outgoing traffic in Mikrotik based on the source interface?

Question

Computer networks

There is a Mikrotik with one WAN connected to the VPN
vpn is assigned the only gateway - therefore it takes over all traffic
There are two interfaces to which switches are connected - for example eth4 and 5
There is a need to separate traffic from eth4, for example, in VPN issue eth5 directly through wan
The essence of the question: is it possible to get by with little blood and just somehow cunningly set routes, or do you need to uncover a tambourine and mark traffic?
Or is there a third way?

Answer 1

Marking the routing with a mark. Here is a description of your case
https://wiki.mikrotik.com/wiki/Policy_Base_Routing