'Multiple layers on a Flourish choropleth map

I made a map of US counties with Flourish, showing different colors in each county depending on some variable. (A choropleth map.) This all works now and looks great.

I want to add layers. By selecting some control option, the value shown in each county changes. So the same map can show income, or population, or voting trends for each county.

Is this possible with Flourish? If so, how?



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