Is it permissible to say, "There is no god but Allah, alone, without partner," after the Adhan concludes, or is that considered an innovation?

Upon hearing the Muezzin, a Muslim should repeat after him until the end of the Adhan, then send blessings upon the Prophet, peace and blessings be upon him, and ask for him the Wasilah, and then supplicate with the well-known supplication. The noble Sunnah of the Prophet has come with this, and the Ahadith indicate that whoever follows this will enter Paradise and intercession will become permissible for him. Any addition to what is mentioned in the Sunnah is considered a transgression of Allah's command, and there is a fear that tribulation and punishment may befall those who violate the Sunnah of the Prophet, peace and blessings be upon him.