Persisting Tooltips by clicking on datapoints

[VikrantRamesh]

I am trying to annotate my chart by persisting tooltips even after the cursor that triggered the tooltip, moves away. I am trying to achieve a click to persist tooltip experience, so that multiple tooltips could be presented in the same chart by clicking on specific points of interests.

I am aware that this could also be done by annotations with a text layer, but I am curious to find out if there is a way to persist the tooltips even when the hovering event is not captured.

Expected Experience:

This is an edited image and is what I am trying to achieve in my chart.

Vega Editor: Link