I haven't use it myself but apparently jupytext (https://github.com/mwouts/jupytext https://github.com/mwouts/jupytext) allows you to save Jupyter notebooks as

I haven't use it myself but apparently jupytext (https://github.com/mwouts/jupytext https://github.com/mwouts/jupytext) allows you to save Jupyter notebooks as R markdown files.