[yakubin]

Am I understanding it right that those plots are only generated in HTML form? I.e. I can't use it to generate an EPS file to be included in a LaTeX document?

[peatmoss]

I believe the engine vega-lite can create an svg, which is pretty easily converted to eps/pdf etc.

[Lisp-Stat]

Yes, vega can do that. If you click on the round button with three ellipses (...) you'll see a menu and one of the options is a PNG or SVG download of the plot.