I’m not familiar with that service. But iirc NIP05 is quite simple. All you really need to do is host a json file as described here. https://github.com/nostr-protocol/nips/blob/master/05.md

For google.domains as far as I’ve seen you either pick your own website hoster or you go with their website builder, which seems to include hosting. For the latter, all you have to do is craft the json file and then upload it into the respective directory, I think.