Is nbsphinx-link supported for keeping notebooks outside the docs?

[leon-k-martin]

Hello, for documenting my projects I've been using Sphinx and nbsphinx-link to keep my notebooks outside the docs folder. Is this currently possible with jupyter books?
I tried adding nbsphinx_link to the sphinx extensions in the _config file but the error ModuleNotFoundError: No module named 'nbsphinx_link' occurs, although the package is installed in the correct environment.

The feature of linking to relative paths outside the jb root would be really much appreciated to avoid hacks like hard-links and equivalent relative paths.

Thanks! :)

L