Could you give a little bit more detail on "terrible experience"? Experimental kotlin notebook support in IDEA is already supported via plugin.

The Kotlin Notebook plugin while is available on the plugins marketplace is absolutely in pre-alpha stage and its status is in active development. More or less it should be usable only after the first official blogpost.

@altavir for example I defined a value model, but it is not available in other cells

But it is. Could you share an example? Idea integration won't help you with the cell model. It is exactly the same.

The biggest issue I have right now is the code completion is missing

Code completion is fully functional in jupyter and datalore. Are you sure it was set up properly?

Hummm, I'll go check again. I followed all the steps.

It is tab key in jupyter

Thanks, solved now