Answer
Use the Aurena Lobby's 'Web Access URL Address' with a pageParams query parameter, formatted like lobby/<lobby-guid>?pageParams=<PARAM_NAME>:$[<Display Name>], for example lobby/<lobby-guid>?pageParams=ORDER_NO:$[Order No] — this passes the clicked element's value through to filter a target element on the same Aurena lobby page, achieving the equivalent of IEE's filtered-postback behavior. This specific syntax was confirmed working from a later Update level onward after being found not to work correctly on an earlier one, so results may vary somewhat depending on your exact release — test on your specific track if it doesn't work as expected right away.