Hello @alvaro89glez, Distill now supports attribute and property selection. Please see https://distill.io/docs/web-monitor/what-is-visual-selector/#how-to-monitor-attribute-and-property-value-for-the-selected-element for more details on this.
You can try monitoring the map’s innerHTML to track changes to their color. Here is another user talking about this technique: Monitor ticket sales - Help and Support - Community Forum - Distill