Add a layer to a map

I want to highlight the adminstrative area on the map where survey data is displayed. Preferably as a semitransparent color polygon below the data plots & heat map. Is there a way to do that in Kobo?

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Also interested: We would like to add the polygon with the border lines of the enumeration area (primary sampling unit) in a household survey.
Kind regards. Best would be if this can be changed dynamically, when the enumeration team moves to the next sample area.
Kind regards