Rumor has it on the next Android update, Google's Bard AI will help you write your text messages. But there's a catch: the processing is done on Google's servers, not your device, so your messages will be sent to Google as you type them. It will be possible to disable the AI, though. If your messages are sent to Google, they will be stored for 18 months and can be seen by humans in "anonymized" form.
Google update shows how Bard AI may work with your messages app