find usages of "__call__" method shows up nothing

Is there any way to find usages for the __call__ method in the project files?

Because at the moment if I try to find usages of the __call__ method it shows up nothing, even though I have a called instance that I know of (Explicitly, of course, the way we call callable objects).

The __init__ method does show results when I find usages when creating instances of classes, even though I do not call it explicitly.