There are some notes on this topic:  https://help.qresearchsoftware.com/hc/en-us/articles/4407577512847-How-to-Automatically-Update-think-cell-Charts-in-PowerPoint

The main issue is that Think Cell requires the underlying tables/data to be formatted in a specific way, which - as I'm sure you've guessed by now - it not the way that Displayr or Q exports tables.  The work-around, I fear, is largely manual and would need to be done to the Excel data that's been exported to PowerPoint.