just found: the docs start with a hint to the jupyterlab-prodigy extension. That`s fine, but one line more let it work:
pip install jupyterlab==1.0.0rc0
this will direct to the right version.
This is important because the jupyterlab extension repo doesn't list the prodigy extension and the current version of jupyterlab doesn't work because of the setup requirements.
grtz// rv