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Hi @lekiend,
Although I have added this in our roadmap (here), that I added when you asked about this the first time, we should start working on this next year.
Not sure if it would work for you, but please note that we have added UBL as an additional output for the invoice, that you can configure in WooCommerce » PDF Invoices » Documents » Invoice » UBL. See: Creating a UBL document
That said, as soon as I have news on the progress of this subject, I will keep you posted 😉