I am sure it must be possible. Not able to figure out how though!
https://www.dropbox.com/s/botampgsz05pzbn/radial-loader.key?dl=0 This is how I would do it, you can increase the granularity/smoothness by adding more data-points to the pie chart.
Didn't get you. There is only a circle drawn using a chart in the file. No animation! What am I missing?
If you play the presentation you should see a grey circle that fills with blue.
It's made with two pie charts, the blue one on top is set to animate in by segment, with another circle on top to hide the slices.
Edit: My bad, looks like grouping the elements broke it. I've updated the link with the working file
Do you mean something like this? https://www.dropbox.com/s/jts9krxpzbvfts3/circular%20animation.key?dl=0
Like this Ron https://www.youtube.com/watch?v=AmNd3Rl9ByM