Accessibility for the hearing impaired, for voice and text telephony

With the Google Pixel, from 6a, it is possible to display the spoken words as text when making a call (even without an Internet connection). Until now, it is only possible in English for iOS. With the Pixel, there are now 6 languages. When will this option also be available for iOS or macOS? I man no Android and would not have this Pixel phone more.