R and Julia’s aren’t good? They’re in the name, so I would have thought support would continue to be strong. I like Julia’s Pluto and the reactive style more than Jupyter anyway.
Some of the unofficial extensions like `code_prettify` don't work for Julia kernels, but at least for my usage, I've never felt the need for such tools in a Jupyter notebook.
Ju(lia)-pyt(hon)-eR
To make it clear
You can do this for as many kernels/conda envs as you need