'How to get list of all available fonts in openpyxl or python-pptx?

I am trying to create a Combobox in Tkinter with a list of all the available fonts in Microsoft office. I am hoping either python-pptx or openpyxl libraries would have a list, but after reading the docs, I couldn't find the location. Where are the list of font name strings stored in either openpyxl or python-pptx?



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