@tbr Interesting question - I was not familiar with the measure, and my cardiologist hasn't suggested it either, so I did some looking. Here is what I found:
https://www.ahajournals.org/doi/10.1161/CIRCULATIONAHA.124.068885
Perhaps the lack of clear guidance on how to use/interpret the test results means it would be of limited use in managing your care?
Why not do your own research on the subject, and go back to the cardiologist with more information on your next visit?