A few days ago, John Nelson (b/t) posted an article on the ArcGIS Blog entitled Steal This Firefly Style Please. In the post, he shares his Firefly style for ArcGIS. Inspired by that post, I attempted to recreate this glow effect in Power BI. While the required gradient setting is not currently available using ArcGIS Maps for Power BI, I was able obtain a similar effect using the Blur format option in the new Mapbox custom visual.
View this 3.5 minute video to see me walk through the Format options that I set:
Read more about Firefly Cartography from ArcGIS:
Steal This Firefly Style Please: https://blogs.esri.com/esri/arcgis/2018/03/07/steal-this-firefly-style-pack-please/
Here are some other quick examples I created with Power BI as well.