Is it possible to modify export hints in Tool mode?

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:bust_in_silhouette: Asked By kubecz3k
:warning: Old Version Published before Godot 3 was released.

Lets say I have this variable:
export (String, "item1", "item2") var list)
I would like to know if it’s possible to use tool mode to modify it’s hints (change their names and count).
If it’s not possible with tool mode then maybe it’s possible with not-yet-stable plugins functionality?