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Rather than put it in a caption, drag a text box onto your viz, or alternately create a new worksheet and put your caption text into the title. When you drop this onto your viz, you can hide the workspace and only show the title.
Peter is correct, you can create a worksheet containing just that text and drop it into your dashboard.
Take a look at the packaged workbook I've attached.
This is where you go to add your text. You can replace <SUM(Quantity)> with your sumvar measure.
This is how it looks on a dashboard (right click title and select hide title)
caption.twbx 1.2 MB