Multiple Vertical Axes in Google Spreadsheet Charts in Javascript

This was tricky.
Chart options are documented in a wide galaxy of different documents, and none of them seems to explain multiple axes charts:

var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheetByName(GlideChartName);
var chart = sheet.newChart()
  .setChartType(Charts.ChartType.AREA)
  .addRange(sheet.getRange("A:A"))
  .addRange(sheet.getRange("B:B"))
  .setOption("title", "Chart Name")
  .setOption("width", 800)
  .setOption("height", 600)
  .setOption("hAxis.title", "X")
  .setOption("series", { 0: { targetAxisIndex: 0 }, 1: { targetAxisIndex: 1 } })
  .setOption("vAxes", { 0: { title: "Y1" }, 1: { title: "Y2" } })
  .setPosition(1, 1, 0, 0)
  .build();

sheet.insertChart(chart);