Has anyone heard of an EIP that allows NFTs to also become wallets themselves, allowing you to store an NFT within an NFT?

I read somewhere that there was a proposal for a standard that would allow for this functionality, I can't find the reference and am hoping someone can point me towards the right direction. The NFT would be assigned its own wallet address which can be used to store NFTs or fungible tokens. I believe I saw it 3-4 years back so it may be a bit old. The closest thing I found was EIP 3386 which discussed locking fungible tokens in a pool. Is there anything closer to allowing the ERC-721 tokens to possess a wallet address for stackable wallets?