Yes! Loads of idea floating around and I think Jon has been working on some improvements for 6.6. Its going to be a big project in 2020 for sure.
(Its something I'm really keen on myself - We use jsonnet internally to version control our dashboards and load them into config maps in our kubernetes clusters)
That's really interesting, would you be keen on open sourcing that bit if you've not already? I know Raj and the rest of the crew are pretty all in on open source.
+1 for using jsonnet. An adequate language for this kind of task! (Here "adequate" is meant as high praise... too often the choice of config langauge isn't.)