Thanks for the quick response! My main use-case would be to adapt a template file e.g. by adding names or other customization with a small python-script and then send the adapted file to the laser.
I also continued to search the forum and with the right keywords, I found this: Launch LightBurn and Load Files into LightBurn using Command Line Interface
So it looks like there wasn’t a way to start a job back in '19.
And it looks as if this is still true: Is there an API available?