When replying to messages here on Talk, it needs to be a minimum of 20 characters. That’s why @heyheymama wrote “plus 20 characters”. Mostly she was reiterating what @jswilson64 was saying.
The MSDS will have information about the makeup of the material in the chalkboard. It does not appear to already be in the Laser library of information. I did a quick google scan and only found an MSDS on the spray on chalkboard paint.
You should do some searching, and maybe call Home Depot and ask for a copy of the MSDS, then the laser experts here will have more to work with to answer your questions. Good on you for asking, rather than just doing and possibly causing damage!