[Solved]-Google Charts, HighCharts or ChartJS Dual Axis Gantt Chart and Line Chart Visualization-Highcharts

That type of chart can be easily created using Highcharts. You can use line and xrange series types with two yAxis:

Highcharts.chart('container', {
    xAxis: {
        type: 'datetime'
    },
    yAxis: [{
        categories: [...],
    }, {
        opposite: true
    }],
    series: [{
        type: 'xrange',
        data: [...]
        }
    }, {
        type: 'line',
        yAxis: 1,
        data: [...]
    }]
});

Live demo: https://jsfiddle.net/BlackLabel/zv74tsoq/

API Reference: https://api.highcharts.com/highcharts/yAxis