It's an interesting problem. The dimensions are shown as reported by Sketcher to the drawing. In Sketcher the section doesn't have a radius dimension, only a linear one that might be, but isn't necessarily, to the axis of revolution. When placing them on the drawing, linear dimensions are moved perpendicular to the sketch plane.
For example, one might be creating a tube with a wall thickness. In this case, one dimension will be to the axis of revolution, but the other isn't, though both are in a radial direction.
So one dimension would have to be converted to a radius/diameter and the other one not converted. However, the wall thickness dimension could be replaced/redefined in Sketcher to represent a radius/diameter. Now it moves from not being converted into a radius/diameter to being converted into a diameter.
It seems to me that PTC could add a special case conversion for any dimensions that reference an in-Sketcher axis of revolution without a large amount of difficulty, and those that happen to coincide with an external axis of revolution with a little more difficulty.
The bigger effort is changing the drawing software to handle axis-normal views by making the orientation of the dimension angle independent of the original sketching plane.
