How to highlight interactable objects in Skyrim?
There is no highlighting of interactive objects in Skyrim. It would defeat the purpose of most puzzles, although it can get frustrating at times. Just be on the lookout and use the local map to help determine if you've seen everything.
This is intentional: They made chests blend in and hid them in hard-to-find places to create a more engaging loot-seeking experience.
As for your answer, a modder will probably do this. If not, I will :p