Using the Siri voices that aren’t static with voiceover

Hi everyone. Hope you’re all doing well. I am using an iPhone 17e with iOS 26. I’ve taken to using the Siri voices with my iPhone, specifically Siri voice 4, US female. However, I’m tired of the voice sounding static, or low quality. Is there a way I can delete the version of the voice that sounds horrible, and install a different one? I remember you used to be able to do such things, but Lord knows I can’t remember the steps to do it. I like the kind of voice, for example, that is being used when you’re using speak screen. So if anyone knows how to do it, please please help. It would be great to actually enjoy. Not just the voices expression, but the quality as well. Also, can you do the same thing on Apple Watch? If so, how?