get nodes to look like piecharts

Hi, great package! I want to include this kind of graph in my next paper, but would want to get more complexity across.

Is there a way to get the nodes to look like piecharts? Essentially make something like this:

I don't have an example, just playing with the idea.

No files, tests, or entry points are mentioned. Start by reviewing how ggnetwork renders nodes and its existing examples, then determine whether pie-chart nodes and their data inputs can be specified; done means a documented, working graph matching the requested visualization.

Written by the indexing model from the issue text.