I have been wondering the same thing for quite a while and couldn't find anything either
Even addons like DataStore save the quest title to their database when accepting/completing quests or from the player's quest log.
Same goes for QuestIsDaily and QuestIsWeekly (both only available on quest dialogs) and GetQuestLink (quest log based). Would love to have a GetQuestInfo(questID) function, but so far no luck.