Haven't tested any iOS 17 betas and don't even know if this is called the Community Dictionary but apparently there's some community-contributed dictionary on GitHub and Apple incorporated it into iOS 17. As far as I know, this dictionary can't be modified locally.
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changing pronunciations
under settings, go to accessibility, voiceover, speech, pronunciations. There you can change the pronunciation of any voice in iOS.
Asking about the community dictionary?
Haven't tested any iOS 17 betas and don't even know if this is called the Community Dictionary but apparently there's some community-contributed dictionary on GitHub and Apple incorporated it into iOS 17. As far as I know, this dictionary can't be modified locally.