How to use nbdev-extensions without settings.ini

Hi,

I’m trying to add a custom directive to nbdev, but without setting up nbdev project from scratch. I’d like to be able to just use nb_export as shown in “modular nbdev” section of the docs, but use a custom directive with it. But based on nbdev_extensions docs, it requires adding something to settings.ini.

How can I add a custom directive when I use just nb_export without other project settings?

Thanks in advance for your help!