Open markdown files as notebooks
The jupytext package allows for easy conversion and manipulation between various formats for python scripts/markdown/notebooks.
Especialy, it allows storing notebooks as python script/markdown file, while opening and editing them as notebooks using a contextual "Open with Notebook" feature :

It'd be great to have this feature in vscode, as for now a "right-click->Open with" on a markdown file only allows text editor and markdown preview. Note that their is a great advantages to edit markdown files as notebooks, because of the simplicity of the raw md (easy VC, easy inspection in raw text editor) and the interactivity for developing/editing as a notebook.
Maybe this should be just an extension and not built-in vscode ? Should it be a jupytext feature request instead ?