I am trying to "group" stacked bar charts and while chartjs has an attribute "stack" in addition to "series", "data", "labels", it does not appear to work with ui_chart.
Example: I have 4 series (Series 1- 4), I want to show Series 1 and 2 in the first bar, and Series 3 and 4 in the second bar. If I use the "stacked = true" in options (ui_control), it stacks all 4 series in the same bar.
It that something that cannot be done with ui_chart node and I should use chartjs and ui_template?
Thanks for your help.