Exporting Khanmigo Chats to a blog

My 9 year old son wants to create a blog where math topics are explored, with all the content based in the world of Harry Potter. He wants to chat with Khanmigo, export the chat to Substack and then add his commentary.

The Khanmigo text is in TeX.

What's the best way of exporting Tex to a regular blog and / or a blog that supports Tex?