I think that's what namecoin was built for? https://namecoin.org/

Also, @dantheman was mentioning that the json can be used to record dns in the Steem blockchain, there was an attempt at making this work I believe but the bottleneck there was a private name server as the standard ones don't know anything about .steem domain names and wouldn't go anywhere. This meant that you'd need to add certain IPs that lead to other name servers that could translate your .steem to the hoster.

Dan's post: https://steemit.com/namecoin/@dantheman/dns-via-steem
And someguy123's suggestion: https://steemit.com/steemit/@someguy123/steem-dns-your-username-dot-steem-dns-on-the-blockchain