https://github.com/SimonBiggs/phosphor-angular-loader
It's on npm as @simonbiggs/phosphor-angular-loader
The repo has a little demo widget demonstrating use as within just phosphor. I've been using this package to create an extension I am currently working on:
https://github.com/SimonBiggs/jupyterlab-form
Using Angular and creating a jupyterlab extension has been an absolute joy.
To view this discussion on the web visit https://groups.google.com/d/msgid/jupyter/CANJQusW%3Du2OYqRAAaeg1n3FTDUdhOGSXL%2B_qp_7NGebHqf11kw%40mail.gmail.com.