Create module for a custom (zipped) text document file format

[tripledee]

Hello and thanks for this tremendous tool I discover from now.
I have many hundreds of text documents saved in a custom file format (a zipped package of binary files). As I'm not used to code in python, how can I create a python package and add it to PrivateGPT settings in order to allow it ingest these documents as any other text content. (I created some code associated with my custom wordprocessor for MacOS' Spotlight indexing and Quicklook preview, but in C/Objective-C…)
Thanks in advance!