Ask HN: Easiest way to get web charts into Powerpoint

Hi, I am working on a new feature for my web app. Essentially my client would like to be able to copy charts from my web app and paste them into Powerpoint. To my knowledge, using most off the shelf chart API/libraries will result in either Flash or images that if pasted into Powerpoint, the result wouldn't be very flexible.

Does anyone know of a better solution? How else would I go about accomplishing this goal?

Thanks