I've never managed to even get x64->x86 cross-compile working correctly, personally, but it should theoretically be possible to target "aarch64-pc-mingw32". I doubt it can be compiled natively on an arm cpu though; I don't think most of the existing mozbuild will run on an arm processor. And taking a look at the packages in Visual Studio 2022, I'm not sure there's an "api-ms-win-core-" include set for arm64, though the latest-but-one SDK version seems to have them for 32-bit arm...
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