Check out this PowerPoint to InDesign converter:
https://www.recosoft.com/products/decksmovein/
It's US$299 per year, but if it's critical, it could be worth it.
Another opton would be to go right from PDF into InDesign.
If you need to edit it further, edit the PPTX, re-PDF it, and update link in ID.
Both Recosoft and Markzware make a PDF-to-InDesign converter.
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