Chartjs-Chart.js: refresh second Y axis step on legend click

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I’ve found my way. Here a snippet for whoever will have my same problem:

onClick: function(event, legendItem) {
    let index = 1;

    myChart.data.datasets[index].hidden = !myChart.data.datasets[index].hidden;

    if (myChart.data.datasets[index].hidden) {
        myChart.options.scales.yAxes[index].ticks.max = maxY;
        myChart.options.scales.yAxes[index].ticks.min = minY;
        myChart.options.scales.yAxes[index].ticks.stepSize = stepSize;
    } else {
        if (stepResult === 0) {
            myChart.options.scales.yAxes[index].ticks.max = 3.5;
            myChart.options.scales.yAxes[index].ticks.min = 0;
            myChart.options.scales.yAxes[index].ticks.stepSize = 0.5;
        }
    }

    myChart.update();
}

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