Color country polygon in amcharts5

Question

does anyone know how to color any one specific country (say for eg France) after onload on amcharts5? On v4 you could do:

polygonSeries.getPolygonById("France").isActive = true;
activeState.properties.fill = am4core.color("#24dd32");

however getPolygonById isnt working in v5. Neither is am4core.color("#24dd32");. Among many other ways i tried doing:

polygonSeries.mapPolygons.template.set({
  id: "France",  // or id:"FR",
  fill: am5.color("#66ff66"),
  fillOpacity: 1
});

but this doesnt work.

Thanks