Set An OverLay Title from GeoJsonParser.features

I wish to request a feature such that
```
let renderer = GMUGeometryRenderer(map: mapView, geometries: geoJsonParser.features)
renderer.render()

for overlay in renderer.mapOverlays() {
print(overlay.title) <<< how to set that value?
}
```

Or maybe my understanding of the title property is wrong? Is that used for something like infowindow? I compared my sample geojsonParser.features total at 29, but the renderer.mapOverlays() totalled 62. if i could find the link between the overlay and feature, that would work for me. Any idea?
I do not see any way to do that from GMUGeometryContainer or even casting geoJsonParser.features to GMUFeature. Am i missing something? Thoughts?

GMUFeature.properties contains values that i supplied. Just that when they are rendered in the map, the overlay or e.g. GMSPolygon has no way to get the properties. Thoughts on how?