To install the app (it just shows the licenses):

./gradlew app-demo:installDebug

To update licenses after dependencies change:

./update-licenses.sh

It will run the updateGoogleLicenses task defined by buildSrc/src/main/java/com/example/tpl/gradle/licenses/LicenseCheckPlugin.kt, followed by exportLibraryDefinitions task defined by com.mikepenz.aboutlibraries.plugin.

On a separate branch detect-license you can see a proof-of-concept for detecting different licenses that could be included in ordinary way.