[Solved]-offset long series labels with lines-Highcharts

you can use annotations with connector shape type.

  annotations: [{
    labeloptions: {
      shape: 'connector',
      ...,
    },
    labels: [{
      point: 'be',
      y: -80
    }, ...]
  }]

live demo: https://jsfiddle.net/blacklabel/58xrhuvz/

api reference: https://api.highcharts.com/highcharts/annotations

docs: https://www.highcharts.com/docs/advanced-chart-features/annotations-module