androidTestUtil in a library

I have a library that contains test-butler. So in the library I do.

implementation 'com.linkedin.testbutler:test-butler-library:2.1.0'

and in the app consuming this library I do:

androidTestImplementation 'com.github.mylib...'

now I am wondering how I could do the same for androidTestUtil - would like that the dependency:

androidTestUtil 'com.linkedin.testbutler:test-butler-app:2.1.0'

comes via the lib and does not need to be stated in the app.