Shade tree mechanics have been installing superchargers for about as long as there have been cars. If a survivor can install a second engine and transmission at Mechanics 8, she can figure how to adjust the pipes to add a supercharger.
That said, it would be easier to add supercharged engines as single installations. Separate turbo- or superchargers would require some code support to adjust the fuel consumption and engine power, but a single engine that included those numbers could be done in JSON immediately.
Anyway, almost all those things you want to add can be done in JSON, and there’s advice for adding them in the Guide to adding new content to CDDA for first time modders. So please go ahead and add them.