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From your explanations, it appears that there is some confusion. The smart-labels
feature is a feature that positions labels in such a way that overlapping of labels is minimized. From what you are saying, it seems that you do not use this feature at all, but would simply like to collapse
Even more, you actually seem to want only to annotate certain points. As I mentioned before, you cannot turn off
labels for some points, I assume that you can use a label template
in which you can toggle the visibility of the visuals, but you cannot make the series not create labels for some points.
Since these labels that will be visible have some special purpose of annotating something, I think you should not use labels at all and use annotations. Here, I think, the CartesianCustomAnnotation is the thing you are looking for.
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