Most people who want a switch have one in China now, they are easy to import from Hong Kong. I have quite a few students who have Switches already.
The games what are in will be in demand will be the same as other places. A few of my students bought the Witcher 3, all of them have Mario Kart 8, and most are planning on buying Pokemon Sword and Shield when they finish their exams in a month.
If Nintendo want more people here in China to buy one, it will need to be cheaper than the price for Hong Kong.
The one thing which they will struggle with is NSO, as from people I have talked to don’t want to pay to play online, so a lot of them just play locally.