Took different approach, although don't know this satisfy the needs or not.
To align the end, I used 0-100 % as axis, and add abs value as text only..
And reversed one axis (100-->0).
% text is Reference line.
You can change text position like this as well.
I know it's not quite excellent...
Newer version (10.5 or higher) might provide other / better solution.
Dynamic Axis End_SM_10.1.twbx 29.5 KB
This worked perfectly for me. Very clever; thank you so much!
Glad that I could help you.