Make a tunnel between Route and L2 interface o_O?

Question

Computer networks

Good afternoon! A non-trivial task arose, the essence is simple, the implementation is terrible)

Nothing comes to mind.

I explain

There are 2 tsiska between them BGP+OSPF+MPLS are configured by VRF'y everything functions OK.
let's say routes go through the first cisco, MANY ROUTES, and they all go through one piece of iron (connected to it) let's say 10.10. /30 192.168.0.8/30 and so on.

a link between ciscos is allowed 172.16.0.1/30 172.16.0.2/30

Task: Route 192.168.0.4/30 over L2 to the fifth port of the second cisco (172.16.0.2/30)

I do xconnect on the port of the second cisco
conf t
int gi 0/5
xconnect 172.16.0.1 100
mtu 1500

How to wrap now in L2 route 192.168.0.4/30 (and only it) from the first tsiska to this L2 Tunnel?
create an additional interface and put L2 + L3 into it?)

I hope I explained it in an accessible way, I’ll even draw an approximate diagram now.
I would be grateful if you tell me "where to dig"