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There is https://docs.microsoft.com/en-us/office/dev/add-ins/excel/ex... if you wanted to port it to JavaScript! It’s a very weird and badly documented async API, but it is possible to lift out the data and, say, use https://github.com/kripken/sql.js . If you’ve got something good going in VSTO though, I wouldn’t waste time trying to port it. Most people doing corporate reporting are indeed doing it on Windows anyways, I’d imagine.

With .NET running everywhere now, I'm hoping VSTO for Mac Office isn't far behind. I really want to use the Grammarly plugin on my Mac also.

Yeah, I'd love a version for Mac. I like what I see, but I've got a Mac-only setup. I wonder if you could make use of VSCode with Excel somehow?