It seems there is no way to use (even a constant) variable for a matrix's axis values.

To be perfectly clear, I am not looking for a dynamic list.  There are a number of tickets open on that already which explain why that is difficult to do.

All that I am trying to do is DRY out a duplicated list for values so that I can change the list in one place in the Jenkinsfile and use it in multiple matrixes in the same Jenkinsfile.