What is the ruling on repeating some verses of the legal ruqyah, such as Al-Fatiḥah, a hundred times or more, and is this considered an innovated repetition?

There is no objection to repeating the recitation of the Quran or supplicating with prophetic prayers, whether by a specific number or without counting; because the Quran is a healing, a guidance, and a mercy. This will be a beneficial treatment, by Allah's will, provided the reciter is sincere, the patient is upright, the meanings of the verses and supplications are contemplated, and both the reciter (raqi) and the one being recited upon (marqi) are righteous.