If I well understand what you mean by vertical on-alignment point, it is probably what is named cardinal points in Rail Track. So yes you can annotate vertical cardinal points. It is in the list for Profile Annotation. If on the profile itself, then VIew Geometry>Vertical Annotation: Points. It could even be dynamic (for the later) if you set View Geometry>Options. It uses a vertical annotation preference of the exact same name than the vertical alignment style.
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