Fun stuff. A long time ago, I did something similar by reverse-engineering the Adobe Illustrator format (technically a PostScript macro dialect.) We generated files that could then get touched up by artists.

Everything but PostScript itself was closed-source. We could have definitely used 5086 pages of documentation. Even 2 would have been nice. Young whippersnappers don't know how good they have it...

AI slides are interesting but you need to beyond a template for it to be really useful

Any plan on working through said constraints to start generating animations?

Is that something you want to open source?