One of the most interesting features that launched with Android 10 on the Pixel 4 is Live Caption. This is a great feature for those who are deaf or hearing impaired. It automatically provides captions for any audio that is playing on your device. It was originally a Pixel 4 exclusive, but last month it came to the Pixel 3 and Pixel 3a. Now, it's expanding to the Pixel 2.
Pixel 2 XDA Forums || Pixel 2 XL XDA Forums
Live Caption isn't one of the most "sexy" features of Android 10, but it's incredibly valuable as an accessibility tool. Getting live captions of videos, music, and podcasts on the screen is super helpful for people who need it. We've shown how you can get Live Caption running on rooted Android 10 devices, but if you don't want to do that, Google is rolling it out to the Pixel 2 and Pixel 2 XL.
Folks over on Reddit noticed that the latest Device Personalization Services version (2.8.286596096) enabled Live Caption in the Pixel 2. Once you manually install the latest Device Personalization Service APK, you should see Live Caption appear in the Accessibility Settings. So now the Pixel 4, Pixel 3, Pixel 3a, and Pixel 2 have access to this feature. Since Google hasn't announced this yet, it will probably take a few weeks to roll out. You can download the APK right now if you don't want to wait.
Source: Reddit