Sankey Chart

[Felix_Roessel]

Sorry can't help you more, have a look at this

3 Node Sankey Diagram

I actually chatted with the blog author about this. He's our authority on Vega-related issues. He actually hasn't been able to successfully achieve what you're attempting using Vega. Not that it's necessarily impossible though! If you have some success, it would be a great benefit to the community if you'd be willing to share! Regards, Aaron