How to rewrite IP internally only using DNAT with LuCi?

I have a simple network setup where I want requests on any laptop on my home network requesting 192.168.1.199 to be internally rerouted to 155.155.155.4.

I've added a photo to help explain the goal.

I've tried adding an SNAT rule to rewrite the IP from LAN to LAN for all protocols, but I'm not getting anywhere. Anything basic I could be missing? I'm not even allowed to ping this IP from the OpenWRT node, so I feel maybe a firewall or traffic rule is affecting this.