This is a very short post just to share a very useful post.
After reading the documentation, trying various samples and reading a lot of articles to configure the Jacoco Tests Reports to export the Instrumented Tests coverage to SonarQube I found this post: https://overflow.buffer.com/2017/01/16/android-test-sonarqube/
I applied the code and after some tweaks it worked. In the end I was missing a property:
property "sonar.jacoco.itReportPath", instrumentationFileName
Now my coverage is complete (Unit+Instrumented) 😀