unity - How to send an interface message?

I come from Unreal, still using it. There, how it works is like this:
Let's say you as a player have a laser gun or something, and when shooting, you use raycast to see if you've shot anything, and if yes, you send an interface message (let's say Damage() function of IDamagable interface) to the hit result, if any.

Now, if the hit result implements that interface and has a Damage() function, it gets damaged. (And of course, if it doesn't implement the interface, nothing happens.)

But in Unity, I don't know how to send that interface message to the hit result (saying "if you have IDamagable implemented, call your Damage() function), but if it doesn't have it, that's fine either.

I've watched many videos on interfaces in Unity, but I still don't know how to achieve the same as in Unreal.