It is indeed possible to achieve this, even though the solution is not very elegant at this point.
If you study the "setuplogview" sample (SetupLogview::onSelectionChanged) in the package, you can find that you may use using -1 to filter out non-selected indices.
(If you have access to WAT, there is a ticket created to enhance this https://wat.grabels-fr0235.slb.com/techlog/ticket/24300)