Many thousands of accounts of miracles are a form of evidence.
Not a form of physical evidence.
Not a form or particularly reliable evidence, either. Ask any lawyer - eyewitness testimony is the least reliable. People frequently see what they want to see. The eye is easily fooled.
There are the miraculous cures that are among the most frequent documented miracles currently used for declaring sainthood.
They are ususally backed by medical documentation, however a shortcoming is such possible in the spontateous regressions in cancer which have been inadequately studied.
The regressions are real but some possible causes have yet to be eliminated, most significantly fevers which have been noted but not seriously studied to any degee.
There goes our court system!