Managing IOS Voices

I noticed that when using the Speak command in iOS shortcuts that there are various text to speech voices to choose. For some reason, I have some voices that are silent like Shelly - Sandy etc. Also old ones like Fred Bubbles I would like to remove…

Is there a way I can fix these silent voices and/or manage the various text to speech voices in iOS?

update : someone mentioned they are here:

Perhaps you should check Settings > Accessibility > Spoken Content > Voices > English

btw: - lots of good high quality ones to download if you like

Does anyone know a way to remove ones we do not want?