In our organization, we have a need to add buffer polygon dynamically to webmap based on a field value in point feature. I played with Arcade and got my script to return polygon geometry but am not sure how to visualize this on the map. Is it possible to visualize in-memory geometry with Arcade?
Although you can calculate a buffer from a point geometry, the geometry visualized is inmutable. You should be able to create a new layer based on calculating a buffer around points. See: https://doc.arcgis.com/en/arcgis-online/analyze/create-buffers.htm