One of the reasons that I suggested that you used FreeCAD 0.19 is that I miss-read your first post.
I was thinking you wanted distance from edge of circle to edge of model or edge of another circle. However there still are many more useful TechDraw advances in FreeCAD 0.19.
Thankyou for all your work bringing us the "many more useful TechDraw advances in FreeCAD 0.19".
Here is a basic quick file from which I extracted the following screen shot, you need FreeCAD 0.19 or newer to read this file correctly since it contains new functionality from 0.19.
OS: Ubuntu 18.04.5 LTS (KDE/plasma)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Build type: Release
Python version: 3.6.9
Qt version: 5.9.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/Australia (en_AU)