Hi Art Vandelay,
We have analyzed your query regarding fixed lines with no
data points in the chart. You can render the fixed lines with text using ChartStripline.
Additionally, we have also shared the code behind for the health stats demo.
You can refer to the code sample through the GitHub repository provided below.
We have attached a sample and screenshot for your reference. Please check the
following code snippet.
GitHub repository: https://github.com/syncfusion/blazor-showcase-healthtracker
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<ChartPrimaryYAxis Minimum="0" Maximum="3.5" Interval="0.5">
<ChartStriplines>
<ChartStripline DashArray="20,20" SizeType="SizeType.Pixel" Text="2.5 avg.
hours" HorizontalAlignment="Anchor.Start" VerticalAlignment="Anchor.End" Start="2.5" Color="#3a69d3">
<ChartStriplineTextStyle Size="15px" Color="#3a69d3"
/>
</ChartStripline>
<ChartStripline DashArray="20,20" SizeType="SizeType.Pixel" Text="1.5
hours" HorizontalAlignment="Anchor.Start" VerticalAlignment="Anchor.End" Start="1.5" Color="brown">
<ChartStriplineTextStyle Size="15px" Color="#3a69d3"
/>
</ChartStripline>
</ChartStriplines>
</ChartPrimaryYAxis>
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Sample: https://www.syncfusion.com/downloads/support/directtrac/general/ze/BLA15F~11124328798.zip
Screenshot:

UG for Stripline: https://blazor.syncfusion.com/documentation/chart/strip-line#horizontal-striplines
Kindly revert us
if you have any concerns.
Regards,
Gopalakrishnan Veeraraghavan