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Emacs and Atom also support interacting with running Jupyter kernels when editing scripts ([1], [2]). In a sense, notebook-less Jupyter kernels already are the "LSP for REPLs".

[1] https://github.com/dzop/emacs-jupyter

[2] https://atom.io/packages/hydrogen

PyCharm also has this integration. You can run python files with “#%%” delimiters for cells or Jupyter notebooks. I had issues with scrolling because opening the notebooks results in a split view with editor and notebook rendering.

That's pretty cool! It would have been much better if it didn't need the #%% and just evaluated the top-level structure (like function definition) with jupyter.

Still just merging the notebooks into the editor is a big step. :-)