I just installed pi-hole and it says version 4 doesn't use dnsmasq anymore [1].
edit: Nevermind, your configuration worked. I verified after flushing DNS cache that archive.is was at first inaccessible, and now after a pihole reboot it does resolve. Thanks!
I wonder if this is another way to set up the same thing with PiHole's "FTL-DNS" [2]
This will resolve the common archive.is domains using Google's DNS service rather than 1.1.1.1 but everything else via 1.1.1.1 as normal.