Sharpness of PowerPoint text imbedded in images

[Notechwiz]

Hi all, I am wondering if there is any way to sharpen text that is embedded in images that are pasted in a PowerPoint shown on Zoom.  The images are very sharp in the actual PowerPoint (I know how to correct for sharpness), but after the recording is processed by Zoom, the text is very blurry so participants can't read it.  These images are screenshots of written handouts and charts. I am hoping to be able to correct a couple of recordings POST processing. . .  Thanks in advance!