Loop through JSON in Zapier.js

let Existing = inputData.existing_values;
let Existing_Labels = inputData.existing_labels;
let Looped_Output = "";
Existing = Existing.split(",");
Existing_Labels = Existing_Labels.split(",");

for (let i = 0; i < Existing.length; i++) {
  Looped_Output += '{\n "label": "' + Existing_Labels[i] +'", \n"value": "' + Existing[i] + '"\n},\n';
}

output = [{Looped_Output, Existing}];