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Hm, neither https://doc.qt.io/qt-5/linguist-manager.html nor https://doc.qt.io/qt-5/linguist-programmers.html point to how to create such a .pro file.
https://doc.qt.io/qt-5/qmake-project-files.html makes me believe it's kind of a Makefile.
https://myprogrammingnotes.com/write-qt-pro-file.html assures me, that it's more or less a plain text file (with certain keywords)