how to create a stacked chart in appian

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{
  a!barChartField(
    label: "Bar Chart",
    labelPosition: "COLLAPSED",
    categories: { "Category 1" },
    series: {
      a!chartSeries(label: "A", data: { 35 }),
      a!chartSeries(label: "B", data: { 15 }),
      a!chartSeries(label: "C", data: { 20 }),
      a!chartSeries(label: "D", data: { 10 }),
      a!chartSeries(label: "E", data: { 10 }),
      a!chartSeries(label: "F", data: { 10 })
    },
    stacking: "PERCENT_TO_TOTAL",
    showLegend: true(),
    showDataLabels: true(),
    showTooltips: true,
    allowImageDownload: false(),
    colorScheme: "RAINFOREST",
    height: "MICRO",
    xAxisStyle: "NONE",
    yAxisStyle: "NONE"
  )
}