Based on my understanding and research, there is currently no ERC1155 standard available on the TON network. This is evidenced by the fact that popular TON marketplaces such as getgems.io and dton do not offer ERC1155 tokens.
Given this, I think it would be beneficial to raise a TEP to propose the implementation of the ERC1155 standard on the TON network. This could potentially expand the capabilities of the network and provide more options for developers and users looking to create and trade NFTs with a quantity.