'In an Azure graph/chart, can I add a constant line to indicate a target?

I am using an Azure web application (app service), storage account and Applicaton Insights. I have been able to make a graph/chart of the availability of my application (Azure Portal -> app service resource -> Health check -> Metrics -> Save to dashboard).

My boss asks me to add a constant red line at 99% to indicate our service level target. I cannot figure out how to do this. Is there a way to add such a constant line to a graph, either from the Azure Portal or by editing the ARM/Bicep templates directly?



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