Clustering - filter popup features

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// returns the total number of features in the cluster
// this will be the same as $feature.cluster_count
Count($aggregatedFeatures)

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// returns the count of features of fuel type 'Coal' within the cluster
Count(Filter($aggregatedFeatures, "fuel1 = 'Coal'"))

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// returns the amount of power generated by coal power plants
// as a percentage of total power produced in the cluster along
// with the total number of coal power plants

// Since the capacity_mw field may not be available on the client
// at runtime, we tell the Arcade engine to request it from the layer
Expects($aggregatedFeatures, "capacity_mw")
var mWtotal = Sum($aggregatedFeatures, "capacity_mw");
var mWCoal = Sum(Filter($aggregatedFeatures, "fuel1 = 'Coal'"), "capacity_mw");
if(mWCoal < 1){
  return "none";
}
var mWratio = Round(mWCoal / mWtotal, 4);
return \`\${Text(mWratio, "#.#%")} (\${Text(mWCoal, "#,### mW")})\`;

// the output will look like "15% (6,500 mW)"

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          let popupTemplate = {
            title: "Coal summary",
            content: `<p>This cluster represents <b>{cluster_count}</b> power plants. <b>{expression/Coal-count}</b> of these plants are fueled by Coal.</p><p>Coal plants produce <b>{expression/Coal-mw-sum}</b> of the total power generated in this cluster.</p>`,
            expressionInfos: [{
              name: "Coal-count",
              title: "Coal-count",
              expression: `
                // returns the total number of coal power plants
                Count(Filter($aggregatedFeatures, "fuel1 = 'Coal'"))
              `
            }, {
              name: "Coal-mw-sum",
              title: "Coal-mw-sum",
              expression: `
                // returns the amount of electricity generated by coal
                // in this cluster as a ratio to the total capacity
                // of plants included in the cluster
                Expects($aggregatedFeatures, "capacity_mw")
                var mWtotal = Sum($aggregatedFeatures, "capacity_mw");
                var mWCoal = Sum(Filter($aggregatedFeatures, "fuel1 = 'Coal'"), "capacity_mw");
                if(mWCoal < 1){
                  return "none";
                }
                var mWratio = Round(mWCoal / mWtotal, 4);
                return \`\${Text(mWratio, "#.#%")} (\${Text(mWCoal, "#,### mW")})\`;
              `
            }]
          };