Can attributes be added to the bar items SVG polygon for a bar series chart

I'm trying to find a way to add my own attributes to the polygon's that are rendered for a bar series chart,

Is this possible in any way? I've looked at extending the bar series and overriding the render method but have run into a few obstacles.

Any pointers to how to achieve this would be great.

I think this is limited by IRenderContext.
Can you use the tooltip feature to define the values that should be written to the svg?
What attributes can be added to the SVG polygon? Is "title" supported?