Keep it simple to keep him happy and healthy.Feed, Hay, fresh water is all your chinchilla needs to be happy.
Treat, give apple, pear, pin, etc... woods.
I wouldn't give those at all either. Like, never. Chins can't process sugars, and dried fruit would have even more concentrated natural sugars than would fresh. Not a good idea, and the chins don't need it, when there's plenty of safe treats that don't harm a chin in any way.