We have currently an Android App at Google Play with more than 100K downloads and thousands of ratings. We want to add App Indexing and following the instructions from https://firebase.google.com/docs/app-indexing/android/public-content we have to associate our site and our app using Digital Asset Links. It requires SHA-256 but we have been signin the app with SHA-1.
How can we migrate from SHA-1 to SHA-256 without loosing all our downloads and ratings on Google Play as they explain at https://guardianproject.info/2015/12/29/how-to-migrate-your-android-apps-signing-key/
Can we just add SHA-256 and maintain also SHA-1, so we don't loose our downloads and ratings?