define regions on the city level of world map

Hi @yohanaton
You can add round markers to any location in the map, if that’s what you need:
https://interactivegeomaps.com/feature/add-coloured-markers/

In the map edit screen, there’s a tab to add Round Markers. Then you can use coordinates to plot the marker in the location you need.

At around min 8:00 I show how markers can be added:

Hope it helps. If this is not what you meant let me know. Greetings, Carlos