Importing articles from a static website: how to?

Site URL: https://bullismoonline.it/

Greetings,

I want to take the articles of an active website that has been built with Jekyll on GitHub and import them on my new website here on SquareSpace.

Since there are many articles I’m looking for a way to do it in bulk.

Is it possible? How?

I can’t install any plugin there (it’s not WordPress), but all the articles are simple HTML pages or Markdown txt files (it depends on the article).