The question's kinda nonsense, tbh. If we had any evidence for it in a way that is observable and testable, that would take it firmly out of the "supernatural" and into the "natural."
If we had evidence for and could study magic, it would become a scientific field with dedicated minds seeking to learn how to apply the phenomenon in a useful manner.
If we had evidence for and could study ghosts, it would become a scientific field with dedicated minds seeking to learn how to apply the phenomenon in a useful manner.
If we had evidence for and could study God, it would become a scientific field with dedicated minds seeking to learn how to apply the phenomenon in a useful manner.
Etc.
Etc.
Etc.
The only difference between natural and supernatural is the evidence supporting it.