Generally the animation storyboards are detached from the control templates and cannot be customized through re-templating. However, you can substitute the default bubble storyboard resource with custom one in order to achieve the desired functionality (the trick is to place a special resource with x:Key="[ThemeName][SeriesType]Storyboard" i.e. x:Key="OfficeBubbleStoryboard" in the UserControl.Resources collection so your custom storyboard gets picked up instead of the default one.
Attached is a sample application to get you started.
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