How to batch import thousands of markdown (or office) documents?

I see that there is this batch import application https://extensions.xwiki.org/xwiki/bin/view/Extension/Batch+Import+Application
But it only allows to import Excel or CSV files.

What is the recommended way in Xwiki to batch import external (non-xwiki) documents?
Because of its importance, I think its a good feature request.

This may be associated with the future strategy/roadmap of Xwiki in order to allow more integrations and API’s?