Is there any support for stacked bar charts yet?

I've tried passing some options based on ChartJS docs:

<c-chart-bar :datasets="datasets" :options="{scales: {x: {stacked: true}, y: {stacked: true}}}" />

Based on what I've seen in the docs it should work, but I'm still getting a regular, unstacked bar chart.
Is it a support issue, or has anyone been able to get this thing to work?