Late yesterday, Google announced “in app” search for App Indexing on Android. It allows developers to integrate their apps to let Google index locally personal content within the app, to be surfaced on search on Android devices, no wifi needed.
Google explained it that “content from your app can then appear for relevant queries in the Google app on Android in the new “In Apps” tab, or as an autocomplete suggestion.” Here is a GIF showing it in action:

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