How to configure nbconvert in TLJH JupyterLab instances?

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I’ve been mashing my head against config files for two days now and can’t figure out this issue. I’d like to simplify the menu options and create a preprocessor to remove inputs/outputs in PDFs based on cell tags. Creation of the file jupyter_nbconvert_config.py is fine, and I can get the CLI version of nbconvert to pick it up (jupyter nbconvert --show-config under the base environment). However, I can’t seem to get JupyterLab to pick up the settings so that File>Save and Export Notebook As…>PDF creates a notebook with hidden cells.

I can’t find any helpful guides on where to put nbconvert settings so that the TLJH-spawned JupyterLab instances pick up the settings. I’ve tried /opt/tljh/user/etc/jupyter/jupyter_nbconvert_config.py (and notebook_config.py). I’ve also tried placing them in /opt/tljh/user/share/jupyter/nbconvert/jupyter_nbconvert_config.py and /opt/tljh/user/etc/jupyter/labconfig/jupyter_nbconvert_config.py

At this point, I’ve placed those settings everywhere I can imagine and none of them seem to apply. Where should they go?

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I found a reference in the docs for jupyter_contrib_nbextensions that mentioned that settings in jupyter_config.{py,json} are loaded by all Jupyter applications. Moving jupyter_nbconvert_config.py to jupyter_config.py` worked, but I feel this isn’t very … sanitary. I’d still like to know the proper location for the settings I’m trying to apply, any assistance would be appreciated.