There absolutely needs to be functionality to allow us to filter data by either a variable or an Arcade expression in the Web Map.
This looks like something that an inline variable would take care of in Model Builder. I just tried something like this (see example #3 in Esri Help)
Thanks, but I was referring to working in the web map. We really need the ability to use variables when filtering data in the online web mapping interface.
Retrieving data ...