What has been reported from the Prophet ﷺ regarding voluntary prayers, such as when he passed by a verse about punishment, he would seek refuge from it, and when he passed by a verse about.

Paradise, we ask Allah, the Mighty and Majestic, for Paradise. If someone does this in the obligatory prayer, is it permissible or not?

And it has not been reported from the Prophet ﷺ that he uttered anything other than reciting the Quran during the recitation of the Quran.

Except for what is related to when the Prophet ﷺ was making qunoot in his supplication, peace be upon him.

So when you recite, the Prophet, peace be upon him, did utter something other than reciting the Quran, and those after him, they say ameen.

Whether that was in his qunoot for calamities, or according to those who say that the Prophet, peace be upon him, encouraged qunoot in witr, so that is included by his statement, not by his action.

As for the issue of a person asking Allah for His bounty whenever he passes by a verse of mercy.

And when he passes by a verse of punishment, he seeks refuge from it, and whoever applies what has come regarding that to voluntary prayers.

applies it to the obligatory prayer, and applying it in that way is permissible, it is permissible, and perhaps one can even be more flexible in that if he passes by.

the mention of a Prophet from among the Prophets of Allah, or our Prophet, peace be upon him, there is no harm in also saying ﷺ.

For example, if he hears the reciter reading, for instance, "Muhammad is the Messenger of Allah and those with him," he says ﷺ to himself, without disturbing anyone or moving his lips, there is no harm in that, and Allah knows best.