~~Create two rules:
1: allow, source 123.123.123.123:any, destination 10.10.10.10:80
2: allow, source 111.111.111.111:any, destination 10.10.10.10:80
Of course you have to delete the autocreated firewall rules. Otherwise anyone will be allowed.
For the source you could also create an alias containing all the sources you want to allow and then use this alias as source.~~
edit: i see now what you mean.
I dont think this is possible with the gui.
But why would you want something like that?