Tooltip for Stacked Bar Chart (Multi-Series Chart)

[ginandtobby]

Hi Community!

I wanted to display values of all series of the same x-axis point in the same tooltip. I have tried this tooltip setting: 

  tooltip: {
    shared: true,
    crosshairs: true
  }

The 'crosshairs' parameter is working, but 'shared' is not working. 'Shared' could work in JSFiddle but not in Looker:

Please advise how to display values of all series in the same tooltip. Thanks!