I asked if loop and reduce is available for Qlik Sense in a chatroom during the Qlik "Visualize Your World" Virtual Forum.
"I'm not aware of loop and reduce being present in 2.0, and there haven't been any announcements since your community post back in April. The capability is planned long term but doesn't have a delivery date yet (that I can see). This might be an interim solution to keep your project moving along:"
"Draft project to implement a QlikView 11 style Loop and Reduce into Qlik Sense"