My name is Tsvetomir and I will be covering for my colleague Tsvetina.
In general, the most straightforward way to tackle the issue is to always have all of the series. For the ones that you would like to not show, I can recommend setting a value of 0. Visually only 2 series would be shown. However, the label would be shown as if a third series was present.
Alternatively, you would have to set the labels template for each of the series declarations and check which one should be used. For instance, if the third series is present, do not render labels for the other ones.
I recommend that you utilize the first approach. However, in case additional clarifications are needed, feel free to contact me back.
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