[Solved]-How to position Highcharts tooltip on top of bar or at 0 line of Y-axis for negative value-Highcharts

you can set the positioner of tooltip like this

   tooltip: {
        positioner: function(__, __, point) {
        return {
          x: point.plotx,
          y: point.negative ? point.ploty - point.h : point.ploty
        }
      }
    }