It is very convenient that the workspace name can be specified using variables; e.g:

   jenkins-${NODE_NAME}-${JOB_NAME}

It would be nice to have the resulting workspace name available as a variable for substitution in the workspace mapping. So instead of writing

    //source/whatever/... //jenkins-${NODE_NAME}-${JOB_NAME}/...

I could instead write

    //source/whatever/... //${P4_CLIENT}/...