how to setup multiple static IP on WAN in pfSense

I have from my ISP a static address (say 70.10.170.100) as well as a range of 2 hosts 69.169.20.120/30. I get handed the first static address when I connect via PPPoE.

I have added a virtual IP entry in pfSense | Firewall: proxy ARP with the 69.169.20.120/30 range.
From the outside I can ping one of my hosts in the range, i.e. ping 69.169.20.121 works.

But I cannot figure out how to setup a NAT port forward so that I can reach an internal webserver from the outside over one of the two range host IP addresses? I don’t want to use NAT 1:1 because I mostly want to have multiple port 80 to the same web server.