Hey again, @Rufus_Casey. Long time no talk!
There is no way to customize the pie chart control directly, I'm sorry to say. It's meant to be a visual placeholder more than a reflection of actual data.
You can, however, change the color of it with a little work around.
If you place a pie chart on your canvas, and then place a circle shape on top of it, you can bring the opacity of the shape down, and change its color. That colored shape will then shade the pie-chart underneath.
Let me know if that works for your, Rufus, and thanks again for taking the time to post. Let us know how else we can help you