Hello,
So if the report files are missing in your pipeline, it’s normal that SonarQube does not report any coverage.
Sorry but my community support is limited to helping on SonarQube problem. In that case it seems to be a pipeline problem and I cannot help on this. I am not even an expert in that domain. You should seek help from Gradle experts to understand why the Jacoco XML report is not generated. You may also read this community guide if that can be of any help.
Olivier