Could an awaken tree or beast learn a class like in Eberron?

@JeremyECrawford could an awaken tree or beast learn a class? Like the awaken tree druid in eberon, in previous lore. Regards Nash

— Nash.dewar (@DewarNash) October 22, 2015

A DM could use the NPC guidelines in the DMG to add a class or new traits to an awakened tree or beast. #DnD https://t.co/oCmwv4z63q

— Jeremy Crawford (@JeremyECrawford) October 24, 2015