(This might be straying into Automator territory but nevermind.)
With the iOS 15 ability to extract text from a photo how would one go about solving the following problem?
" Get me the photos containing the following text."
It could be automation, it could be a search in Photos itself. What’s returned could be a view in Photos, or a list of photo identifiers, or something else.
A use case might be: “I know there’s an electricity bill from 3 months ago I scanned to Photos but I can’t find it now”.
Searches could be literal or wildcarded or, gulp 
, ReGEx.
And “there’s an app for that” is a perfectly good answer. As is “some assembly required”.