As far as the software goes, people have used Lightburn to create SVG and PDF that can be used with their Glowforge.
In terms of trying to make the glowforge a standalone laser cutter that can be operated with local files rather than a cloud connection… There was a whole organization called openglow that tried to do that you can still go to their website and read their research.
Spoiler alert: they never solved the problem, and the project is pretty much dead. The archive posts are very interesting but they never solved the reverse engineering problem in any usable way.