I had opened the following case and received the answer that Report
Builder with version 2.0 is still under development :
https://experienceleaguecommunities.adobe.com/t5/adobe-analytics-questions/when-will-report-builder-be-upgraded-to-api-2-0/qaq-p/380126/comment-id/20019#M20019Let's
push to have this release be sooner rather than later!