Looking at this How To post about popups, it looks like it's possible to use Arcade to create a popup that indicates if there's intersect between multiple feature layers on ArcGIS Online. Is it possible to create a new field in the attribute table of a hosted feature service that uses attribute expressions to do this? We would like to create a dashboard that tells us when there's overlap between features in multiple feature layers, and if it's possible, using Arcade to create a new field with an attribute expression to do this would be perfect.
Display attributes of intersecting features in a pop-up via ArcGIS Arcade
https://support.esri.com/en-us/knowledge-base/how-to-display-attributes-of-intersecting-features-in-a-000028227
Populate a feature layer field based on attributes of another using Arcade in ArcGIS Online
https://support.esri.com/en-us/knowledge-base/how-to-populate-a-feature-layer-field-based-on-attribut-000031934