Downloading miis?

So ik we’ll be able to carry miis over from the demo to the main game once it releases but I’ve been replaying the demo on my other player profile and I’m wondering if/how I’ll be able to have the miis I created from my second profile in the full version of the game on my main profile without having to remake them completely. My first thought was to download them to my switch but i genuinely can’t find any way to do that, wondering if anyone had any more knowledge or any other ideas on how to do that?