In Android Studio, is there a way to search a word within jar, aar, and maven imported libraries?

On Android Studio, for searching something within the imported libraries, you can try :

Open Edit menu

Select "Find" -> "Find Usage Settings" and select the Scope as "Project and Libraries"

OR

Select "Find" -> "Find in path" and select "Scope" scope specifying this as "Project and Libraries"

Hope this is helpful.