See comment: https://github.com/JetBrains/lets-plot/discussions/952#discussioncomment-8045168 ([Snakey diagram](https://sankeymatic.com/)) Also: - [Data-to-Viz](https://www.data-to-viz.com/graph/sankey.html) - [Coding for Economists, sankey diagram](https://aeturrell.github.io/coding-for-economists/vis-common-plots.html#sankey-diagram)
