Thank you. You can install lab extensions in the Dockerfile. Just add `RUN jupyter labextension install {your_extension}` before the EXPOSE statement.

If you use the base image of the configurator, the configuration already includes JupyterLab and Jupyter Notebooks. If you want to write your own Dockerfile, the following commands install (and upgrade to latest) Jupyter:

RUN pip install jupyter --upgrade
RUN pip install jupyterlab --upgrade

For example, have a look at the base-image of the provided configuration: https://hub.docker.com/r/leandatascience/jupyterlabconfiguration