Can we create proposal with ERC721 and voting by ERC20 in DAO governance
That sounds like a use case for implementing erc1155 within governance. You would then have a minting event per proposal token and a single minting event of x number of voting tokens. The downside would be the lack of decimals on an erc1155-managed voting tokens.
Otherwise, the governance contracts would need to handle two tokens. propose functions would need to check for a delegated NFT and castVote would need to check the non-fungible token. Doable, but feels somewhat messy.