You will have a laser that can make a jig and you should be the one to make the jig as it will need to be custom fit. @Stroonzo did a great job of laying it out for you and to be honest, this is the best and easiest way to get what you want to achieve.
Once the first letters are burned in, you flip the dice and burn the next row and so on. His technical language sounds a bit scary to a novice, but LightBurn makes it incredible easy.
LightBurn will automatically center the lettering on each dice for you. Once you have everything aligned you just hit run and wait until the job is finished. It will take a bit of trial and error, but this is a great community and people are very helpful. Good luck!