Well done. I wish I could provide such through and complete usage manuals as this one with practical examples to boot.
I have a few separate things I'd like to comment related to this tool, so I'll create a separate comment for each of both.
For starters, It's well presented and it's well done. Quite visually interesting. I see quite some (intended or not) inspiration from Ren'Py's own tutorial. That makes it flow nicely. The links are also fairly welcome.
By the way, while checking this out I found a single typo:
Let us first look at how we put voice lines into our sript. This is important.
With all that text for a jam, typos are those things that appear out of nowhere, no matter how many times you read, you read it right until someone points it out and then it magically becomes wrong 🤣.