Can I individually add labels to the plot?

[duskmoon314]

I want to draw series and add labels separately.

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What I want

In the example, labels are added immediately after draw_series:

chart
    .draw_series(...)?
    .label(...)
    .legend(...);

I want to do them separately. That is, I can add labels before or after the drawing. Maybe something like:

chart.draw_series(...)?;

chart.add_label(...).legend(...);
chart.configure_series_labels().draw()?;

Is there a way to do this in the current version?

Why I want to do this

I'm writing a function that transforms some data to Vec<DynElement> and draws them at the end of the function. The Vec may contain multiple series, and draw_series(...) seems only to return one SeriesAnno object. So, I would like to find a way to add labels individually.