Don't think ther is a function to place that type of dimension automatically......however, a workaround would be to place a fine line sketch, using draw-in-view, and then return to the working sheet to place a smart dimension on that line.
Design Manager Streetscape Limited
Solid Edge ST10 [MP0] Classic [x2 seats]
You can do that - on the dimensioning toolbar there is a tangent option
Click that before selecting the first circle/arc and you can dimension tangent to tangent.
Look at the position from his dimension.