Done! Check out this blog post for information on how to do it: https://blog.expo.io/64-bit-support-and-android-app-bundles-fe0c6a28669
In my case the Play Store advices me to here: https://developer.android.com/platform/technology/app-bundle
I cannot go further to Google Betatest while the warning says "not optimized APK".
@Daniel: Getting the same thing, have you had any luck?
@Daniel: Me too. I could not release my APK file with this warning
@Kowsheek Mahmood @Henry Dao yes, have a look at https://github.com/expo/expo/issues/4597
you have to turn every grey checkmark in the Google Play Console sidebar to green with providing the necessary information inside of each point.