The reason you don't hear much about this is ... well bitcoin (purposely) does not have a robust enough smart contract architecture to make NFTs easy. Bitcoin is for censorship-resistant payments, not for storing hashes for jpegs. But there are other second-layer protocols that have better support for NFTs.
NFTs around Bitcoin:
Counterparty
Liquid Network (see Raretoshi.com, Infinite Fleet (game, with NFTs))
RGB
RSK
Other emerging protocols that enable tokens on Bitcoin
Long before ETH was even a glimmer in Vitalik's eye there were NFTs on bitcoin. They were called "colored coins".
https://bitcoin.stackexchange.com/questions/5695/what-are-colored-coins
Then when another second layer known as CounterParty protocol was designed, that enabled NFTs,... such as Rare Pepe:
https://www.rarepepe.io
https://bitcoin-takeover.com/bitcoin-nfts-on-counterparty-and-how-to-get-or-create-your-first-one
The reason you don't hear much about this is ... well bitcoin (purposely) does not have a robust enough smart contract architecture to make NFTs easy. Bitcoin is for censorship-resistant payments, not for storing hashes for jpegs. But there are other second-layer protocols that have better support for NFTs.
NFTs around Bitcoin:
https://www.lopp.net/bitcoin-information/other-layers.html
https://decrypt.co/82891/bitcoin-nfts-stacks-blockchain
Tokenised Securities & NFTs on Bitcoin with Adam Back & Samson Mow — What Bitcoin Did
#1941
https://www.whatbitcoindid.com/podcast/tokenised-securities-nfts-on-bitcoin-with-adam-back-samson-mow