Localizing numbers in gux-visualization tooltips?

[shrihari-prakash]

Hello Spark Team,

I am trying to use the gux-visualization, and the tooltips inside it, seemed to render numbers without separator (for example 1200 instead of 1,200). I fiddled around and found that I can pass a d3 formatter to the visualizationSpec inside the tooltip but looks like I need to pass strings like ',d' which as you can imagine is not localizable. Is there any way that I can get the numbers localized?