The purple bar is the default frame that blizz use. So, it looks like by default there are no text value displays apart from mouseover like with the health and mana bars which nUI have adjusted to show the values for. It would involve customizing the new special bars to permanently display the text value.
I'll take a look tonight and see how simple that would be. I have a demo warlock so can test that specifically but if it works it should be possible to do it similarly on other bars that aren't easily identifiable.
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