Percentage axis only in positive range

[wiggal]

How can I limit the percentage scale to the positive range of the first Y-axis.

[wiggal]

Here is the solution for most cases

      y2: {
        type: 'linear',
        display: 'auto',
        position: 'right',
        min: (context) => {
            return (context.chart.scales.y.min / context.chart.scales.y.max * 100)
        },
        max: 100,
        grid: {
            drawOnChartArea: false
        },
        ticks: {
           stepSize: 20,
           font: {
             size: 20,
           },
           callback: function(value, index, values) {
              return value >= 0 ? value + ' %' : '';
           }
        }
      },