How to build a stacked bar chart overlay in highcharts?

Depending on your requirements you can use normal or percent stacking option for three stacked series. The rest of the series goes without stacking.

  series: [{
      stacking: 'normal',
      data: [2]
    }, {
      stacking: 'normal',
      data: [2]
    },
    {
      stacking: 'normal',
      data: [4]
    },
    {
      data: [8]
    },
    {
      data: [8]
    }
  ]

The other options that you will need are formatting series.dataLabels and xAxis.labels.

Demo that you can base on: https://jsfiddle.net/BlackLabel/sLgyhoz9/

API References: https://api.highcharts.com/highcharts/series.bar.stacking https://api.highcharts.com/highcharts/series.bar.dataLabels.formatter https://api.highcharts.com/highcharts/xAxis.labels.formatter