Using Transformed timeseries in Custom Series

[jdunham22]

I want to use a transformed (moving average) series in a custom series. This seems like it should be easy but I can't figure it out. I can make the transformed series and it has an alias and shows up on the plot, but then it never appears anywhere in the left column so I can't drag it into the input timeseries box in the custom series editor. I'm using v3.15.0 for Windows.

Google Gemini says this:

In PlotJuggler,
you cannot directly reference a "filtered" version of a series inside the Custom Function Editor if that filter (like Moving Average) was applied only as a visual transformation in the plot area.
To use a moving average within a custom series, follow these steps:

1. Create a "Persistent" Moving Average Series
   First, turn the moving average into its own data series so it appears in the Timeseries List:

   Right-click your original series in the list.
   Select Apply Filter -> Moving Average.
   This creates a new series (e.g., my_signal/moving_average).

But I'm not sure if it's just hallucinating since there is no right-click menu for me on the timeseries list items, and I can't find any other way to make this transformed plot into a "persistent" series, and I didn't see anything about this in the tutorial slides.