allows users to select a specific area (using rectangular, radius, or free-form pallet) on a map widget and update data appropriately.

Yes, this suggestion is much needed. It was also suggested by others in different posts. Please consider adding this feature!!

This is now available in the Azure Maps visual: https://powerbi.microsoft.com/en-us/blog/power-bi-march-2021-feature-summary/#post-14033-_Toc65500391