Want chart that highlights "CLOSED" state of a contact rather than "OPEN"

Setup, Configuration and Use Beginners
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1

I’m running OH 3.1.0 on Linux
I have a chart of a contact item that reports “OPEN” or “CLOSED”; I get a chart with the look I want, but want “OPEN” highlighted, rather than “CLOSED”

The relevant YAML from the chart definition (which was based off an “Analyze” for that item, but is now one axis on a multi-axis chart) is below:

yAxis:
    - component: oh-value-axis
      config:
        gridIndex: 0
    - component: oh-category-axis
      config:
        gridIndex: 0
...
Series:
   (3 other series omitted)
...
  - component: oh-time-series
      config:
        name: Heat Call
        gridIndex: 0
        xAxisIndex: 0
        yAxisIndex: 1
        type: line
        item: HVACSensors_HeatCall
        areaStyle: {}
      slots:
        markArea:
          - component: oh-mark-area
            config:
              name: HVACSensors_HeatCall
              item: HVACSensors_HeatCall```

I've scoured the OH and eCharts documentation, but don't see anything that looks relevant, but I know from past experience with other charting packages that there are often ways to get from A to B that aren't obvious.