Adding new language support for code blocks


I’ve recently started a new job for a company which developed it’s own programming language.
It has been around for a while now (20+ years) and used by some tens of thousands people worldwilde.

In a recent meeting we were wondering if it would be possible for the language we develop to be supported for code blocks highlighting.
If it is, would you please guide me to some ressources on how to do so.

Thanks by advance for your help.