Apparently it's quite easy to do. There's tutorials out there. You basically need to know how to get into the bios, boot to a USB C drive (that has Windows 10 install media on it) and go from there. Or clone t he existing drive, with a caddy. You also have to find an M.2 2230 drive. (There's a few knocking around on Amazon and eBay.)
All in all... not a difficult task... depending on your knowledge of this stuff.