@rmicfequant
You can use Combo Map.
There is some public dataset in bigquery covering whole world population with km2/squares as polygons.
You can export this data and use Combo map which shoudl allow you to show bublle and areas and hopefully cover big city are. (I think maps hhve limit of 1 mln of polygon vertices.)
This is example of areas with polygons and now you can put also coordinnations of your second layer on combo map showing for example square footage of parks. Just curious how you would like to compute the secon on a lat, long level basis?