Minecraft Bedrock multi-player world copying

I think it would be cool to copy lan or friends worlds, because it would be nice to play them when the host isn't online, whether thats creative or survival. Here's a example; imagine you and your friend have a survival world. Say you have a cool base in said world, and would like to show it to your other friends even when the host is off-line, or, you can use a creative version of the world to make pre planned builds.