I originally wrote this as a Reddit comment, but it was deleted (I guess because it has links? idk), so I'm creating this Gist instead to document how I was able to boot the Windows installer on this laptop.
Note that the easiest solution is to just download the recovery media creator from Lenovo's support site, but I wanted to run the stock Windows installer, so this outlines how to do that.
Here are the steps I took to boot the Windows installer on my Lenovo Yoga Slim 7X (with an ARM64 Snapdragon Elite X CPU). I initially tried using Rufus, and while that drive did show up in the boot menu, selecting it would just hang on the YOGA logo forever.