Would it be possible to add a legend with a vertical line that cuts through all items?

[amitkc1]

Hi, first of all, I'd like to thank you for building and making this feature available in angular. I'd like to if there is a way to add a legend on timeline. An example would be, adding a birth date. Since, this is a single date, instead of adding it as another item on scheduler, it would be nice to have it represented on the timeline. If you could provide some direction, that'd be great.