We don't import PlantUML directly yet, but something we can look at.

That'd be pretty cool!

I'm curious what JavaScript/React libraries do you use to generate your lines and boxes visuals?

We use https://pixijs.com, great project!

Cool! Does PixiJS draw the arrows and boxes and stuff for you or did you have to implement that yourself?

PixiJS is a bit lower level, it has some primitive shapes like line/box but we draw most things ourselves.