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Check this out: https://gist.github.com/ajaydsouza/c8defd4b46e53240e376#file-tptn_list_cats-php

The developer docs are a major work in progress for this year. Happy to answer your questions as to what you’re looking for.

You need to add that in your theme’s functions.php or in a file in the mu-plugin folder. This will ensure it’s not overwritten.