// Find the counties layer in the map and set the popup template.
      const countiesLayer = viewElement.map.layers.find((layer) => {
        return layer.title === "USA Counties Generalized Boundaries";
      });
      countiesLayer.outFields = ["*"];
      countiesLayer.popupTemplate = {
        title: "{NAME}",
        content: queryChargingStations,
      };

      function queryChargingStations(target) {
        // Count and types of electric charging stations that intersect the county.
        const countLevel1 = new StatisticDefinition({
          statisticType: "count",
          onStatisticField: "EV_Level1_EVSE_Ports",
          outStatisticFieldName: "numLevel_1",
        });
        const countLevel2 = new StatisticDefinition({
          statisticType: "count",
          onStatisticField: "EV_Level2_EVSE_Ports",
          outStatisticFieldName: "numLevel_2",
        });
        const countLevel3 = new StatisticDefinition({
          statisticType: "count",
          onStatisticField: "EV_DC_Fast_Ports",
          outStatisticFieldName: "numLevel_3",
        });
        // Create a query object with the target graphic's geometry and the outStatistics.
        const queryObject = new Query({
          geometry: target.graphic.geometry,
          outFields: ["*"],
          spatialRelationship: "intersects",
          outStatistics: [countLevel1, countLevel2, countLevel3],
        });
        // Execute the query with the query object.
        return query.executeQueryJSON(queryUrl, queryObject).then((result) => {
          const stats = result.features[0].attributes;
          // Format the query result for the counties popupTemplate's content.
          return `<b>${stats.numLevel_1 + stats.numLevel_2 + stats.numLevel_3}</b> level 1, 2, and 3 electric charging stations intersect the boundary of {NAME}.<br><br> The number and type of stations:<br><ul><li> Level 1 Charging Stations (120V, AC): ${stats.numLevel_1}</li> <li>Level 2 Charging Stations (240V, AC): ${stats.numLevel_2}</li><li> Level 3 Charging Stations (480V, DC): ${stats.numLevel_3}</li></ul>`;
        });
      }