I'd be greatly surprised if there's any Linux support at all. Microsoft supports macOS, iOS, and Android these days not because they care about interoperability

I'd be greatly surprised if there's any Linux support at all. Microsoft supports macOS, iOS, and Android these days not because they care about interoperability, but because Microsoft needs users on these platforms. If Microsoft cared about interop. for the sake of anyone except Microsoft, OOXML wouldn't be crap, and their office suite wouldn't be crippling ODF files on save. Microsoft has a much longer (and quite colourful) history of not-supporting and breaking interop.