I created a clean virtual environment where I installed JupyterLab and Quarto: ``` pip install jupyterlab jupyterlab-quarto ``` However, it still does not seem to work - notably the frontmatter is not rendered as in the [screenshot in README](https://github.com/quarto-dev/jupyterlab-quarto?tab=readme-ov-file#jupyterlab-quarto-extension): 
I created a clean virtual environment where I installed JupyterLab and Quarto:
However, it still does not seem to work - notably the frontmatter is not rendered as in the screenshot in README: