Hide specific metrics from legend in line chart

Hi, I am trying to create a line chart with a reference line that is an aggregation of a metric. I don't want to show the original metric, only the reference line to it. When I put the metric in optional, it doesn't show the reference. I can set the line weight to 0 of the metric and then show the reference line, and this works well. However, the original metric still shows in the legend. I don't want it showing in the legend.

Is there a way to hide metrics from the legend?

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Hiding the legend and making a custom legend (https://how.withlookerstudio.com/data-viz/20200416-looker-studio-chart-legend/) is the best solution I have found

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