Display Plot with HoverTool

I’m essentially building off the Periodic Table example, so I’ll use that to illustrate the idea. I’d like the user to be able to roll over the elements and have the tooltip display a little x-y plot that provides some additional data on the element in question. I’ve read the hovertool documentation, but the only customizable aspect of it appears to be the color, font, etc. (basically things that can be controlled by HTML). It looks like the way the hover tool maps names to columns in a data base doesn’t allow for this functionality…but I thought I’d ask to see if anyone’s achieved anything like this. Any suggestions out there?