I do not know such addon.
Afaik you cannot differ treasure (treasure cards from inventory) chests from normal chests, or any thievery chests.
Maybe their name is different but noone wants to hardcode 20 language names of chest types to distinguish them
But the events and callbacks just tell you: "Opened a chest" -> No matter if overland normal, dungeon, or whatever chest type you find.
That's why daily endeavours also count for chests if you open any of them.
Or if it's about "unlocking" it also counts to open locked doors.