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What's the state of things at Libre office regards to this? Do they support python or other languages for macros and for formula/expressions?

There's a Python wrapper for the Java API. Documentation is scarce. Also Libreoffice only supports any of the nice and new Excel functionality .... since last month: https://bugs.documentfoundation.org/show_bug.cgi?id=126573

yes python supppoted in libraoffice