you can create your personal voice on ios 17 under settings-accessibility-personal voice. It will only take maybe 20 minutes where your read a150 random phrases for training, then let the phone plugged in overnight, then you can let it read any text you type when you enable “live speech”. usually it’s triple-click the power button to activate it.

It will sound almost like your own voice!

I haven’t found a way to use it for the “spoken content” voice though, maybe in a later version of ios? or does anyone know how?