Get current color of a plot element (e.g., hv.Curve)

I’m adding VLine annotations to a plot and I’d like to color them to match a family of Curves and Scatters which are colored by one of their value dimensions. Ideally, I’d like to query a Scatter object for it’s current color and set the VLine to match without having to generate an explicit mapping beforehand.

So, how do I query an existing element for it’s current color to use with a new element I’m creating?