How to set up NAT for outgoing requests to Mikrotik?

Question

network hardware

It is required to break access to the pool for the ASIC, but not just block it, but quietly change one external IP for another for it. I create a NAT rule:
/ip firewall nat add chain=srcnat src-address=(the one where the request goes) protocol=tcp src-port=(port) action=netmap to-addresses=(where we actually send the request) to- ports=(port)
How to fix the rule to make it work.