how to get our android app to be found in Google Search Using App Indexing.
Fortunately for you there's Firebase App Indexing:
Firebase App Indexing gets your app into Google Search. If users have your app installed, they can launch your app and go directly to the content they're searching for. App Indexing reengages your app users by helping them find both public and personal content right on their device, even offering query autocompletions to help them more quickly find what they need. If users don’t yet have your app, relevant queries trigger an install card for your app in Search results.
Check the Android Setup to get started right away.