Sorry about that. I would be very surprised if there was a generic solution out there, as dynamic SVGs are pretty advanced. I did some searching, and didn't find anything off the shelf. If I see something, I'll post it.
If there's nothing out there (likely). Do you have someone who can make an SVG for you? If so, ask for an annotation bubble, with whatever text you feel you'll need. The rest is javascript. This would be actual work, I know, but hey. Good luck.
-- Cole