i liked the idea of leveraging jupyterlab as server. data engineers/scientists already use jupyter, so this is neat idea.

custom extension for jupyterlab is a great way to leverage existing jupyterlab install base: not everyone will be willing to install and jump through hoops to install software X, but installing extension is one pip install away and no need to run separate process, since you are running inside jupyterlab server.

this reminds of ALTERYX (another drag and drop ETL tool)