Speech recognition and automated captions for voice messages

#### Is your feature request related to a problem? Please describe.

People sending voice messages to people who cannot or don't want to listen, but prefer to read.

#### Describe the solution you'd like.

Speech recognition for the voice message so that it can be read.

#### Describe alternatives you've considered.

The sender could also use e.g. android keyboard speech recognition and send text. But that seems unlikely.

#### Additional context

https://commonvoice.mozilla.org/