Dynamic Cluster Marker

[Calvin_GIS]

Hi guys, 

New to ArcGIS online. I have managed to enable the 'cluster points' feature in WebMap. Anyone know if there's an option to enable dynamic labels, if so how. So when I am zooming in and out of the map, the cluster point will indicate how many point features are sitting within (example below). 

Thanks. 

[RussRoberts]

The dynamic cluster labels in Map Viewer(not map viewer classic) show the count of the number of features is already present. The clusters will change as you zoom in/out.