So you are asking for https://github.com/takluyver/nbexplode https://github.com/takluyver/nbexplode and https://github.com/ipython/ipynb https://github.com/ipyt

So you are asking for https://github.com/takluyver/nbexplode https://github.com/takluyver/nbexplode and https://github.com/ipython/ipynb https://github.com/ipython/ipynb respectively. There just not maintained enough to be in the core :-)