Deaf friend

Thank you for the post, we do not disclose any updates ahead of the schedule. However we have a huge amount of accessibility features that may help:

https://support.apple.com/guide/iphone/overview-accessibility-features-hearing-iphb210be03a/ios

Your question seems related to a consumer feature and is better suited for the Apple Support Communities. They can help you to find the accessibility feature to use in this case.

https://discussions.apple.com/welcome

Hope this helps

Albert Pascual
  Worldwide Developer Relations.