Thanks for your question. We're excited about the Jupyter Notebook functionality in RStudio Connect that you linked to.
However, the capability to publish Jupyter Notebooks is only available for RStudio Connect, and that functionality is not currently planned for shinyapps.io.
RStudio Connect contains a superset of functionality compared to shinyapps.io in that you can publish Shiny apps as well as R Markdown documents, Plumber APIs, Tensorflow models, and now, Jupyter Notebooks to Connect.
The only related Python functionality in shinyapps.io is the capability to publish Shiny apps that use Python via the reticulate package, as described in https://support.rstudio.com/hc/en-us/articles/226905928-Can-I-use-Python-and-rPython-with-shinyapps-io-.