Joodatabase Field in JS in Google Maps

<div id="map" style="width:500px;height:500px;"></div>
     <script>
      // This example creates circles on the map, representing populations in North
      // America.

      // First, create an object containing LatLng and population for each city.
      var citymap = {
        chicago: {
          //------------------ JOODATABASE FIELDS-------------
          center: {lat: {joodb field|latitude}, lng: {joodb field|longitude}},
          population: 2714856
        }
      };

      function initMap() {
        // Create the map.
        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 10,
          center: {lat: 45.4064823, lng: 11.821206,12},
          mapTypeId: 'terrain'
        });

        // Construct the circle for each value in citymap.
        // Note: We scale the area of the circle based on the population.
        for (var city in citymap) {
          // Add the circle for this city to the map.
          var cityCircle = new google.maps.Circle({
            strokeColor: '#FF0000',
            strokeOpacity: 0.8,
            strokeWeight: 2,
            fillColor: '#FF0000',
            fillOpacity: 0.35,
            map: map,
            center: citymap[city].center,
            radius: Math.sqrt(citymap[city].population) * 1
          });
        }
      }
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=xxxxxxxxxxxxxxxxxxxx&callback=initMap">
    </script>