After plying the depths of those charts, I found a solution for this: 
http://stackoverflow.com/a/22542682/613559

On Thursday, March 20, 2014 1:31:04 PM UTC-4, Marco Bottignole wrote:
>
> Hi all,
> i've a line chart populated with json values, with HTML tooltips and 
> annotationtext.
> My question is: How to setup the annotation with HTML? I think it is 
> possible because here: 
> http://www.google.com/trends/explore#q=Madonna%2C%20Adele&cmpt=q it 
> works, but i don't undrestand how!
> Some suggestion?
>
> Thanks in advance.
>

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