Chartjs-ChartJS: Is this horizontal stacked bar and line graph multiaxis chart even possible?

Currently it’s not possible (only proof I could find right now).

The next version of chart.js will be 3.0 which has many major impovements, including changes to the horizontal bar chart, verbatim “Remove horizontalBar and make all charts capable of being horizontal”. I think it will be possible with this version. But unfortunately not now.