ReStructuredText documents are more powerful than Markdown files, links are more flexible and can be better defined (eg, footnotes). RST seems to be a better fit for Jupyter-Notebook "README" files (with instructions and external references about the environment), but JupyterLab does not have (yet, apparently) an extension for rendering (aka, a viewer) those documents.
Double check for the existence of such extension, if not, consider implementing one.
ReStructuredText documents are more powerful than Markdown files, links are more flexible and can be better defined (eg, footnotes). RST seems to be a better fit for Jupyter-Notebook "README" files (with instructions and external references about the environment), but JupyterLab does not have (yet, apparently) an extension for rendering (aka, a viewer) those documents.
Double check for the existence of such extension, if not, consider implementing one.