how to redirect to external cache from gateway?

hello;

i have a mikrotik gateway it’s ip is: x.y.z.193/28, i have traffic limitation for all my servers in the simple queue in the gateway,
i have a external cache engine, how to redirect all traffic passing by the gateway on port 80 to this cache engine???

i have tried “same” in firewall nat but not working, i can redirect the traffic on each server individually using same or dst-nat, but on the main gateway i cannot.

ps: we have a route on our gateway that links an internal private ip address between us and the provider.


regards.