How to convert a Markdown file (or text) into a Mathematica notebook? For example, easy conversion of comprehensive MSE posts is desirable. --- Possible approaches ordered according to their convenience: [ ] Extensions of "pandoc" and/or "jupytext". [ ] Web service that does that. [ ] A Mathematica package that does the conversion. (An inverse of "M2MD".) [X] A stand-alone implementation (in some programming language.) --- This question is an inverse of "How to export a Mathematica notebook i...