The first set of instructions didn't work.
So I followed the Google doc Arm-64 instructions: Downloaded the stable model of "Mac OS X Arm64", copied the Arm-64 contents and replaced them in Grove's contents. But I can't find "app.nw" nor "package.json" anywhere even with search for those items.
Is the "Mac OS X ARM64" option on the site different from "macOS ARM64" in the google doc instructions?