Hey I'm working on this too! Nothing to show off yet except for this fun animation I made when playing with the core engine: https://imgur.com/a/ELhwWo5.
My inspiration came from Bret Victor's Drawing Dynamic Visualizations (1). Though I'm taking a slightly different approach. Brett’s data is declarative, but drawing is procedural (in steps) where mine is all declarative. I think Brett's approach is more powerful but doesn't lend itself as nicely to normal vector drawing UX.