That's a solution I haven't used before. My way just requires you to "do it on the fly" by adding a trace to a plot pane containing the term ((V2-V1)/I12), where V2 and V1 are the voltages at the ends of the "resistor", and I12 is the current through the "resistor". Those node voltages and branch currents exist in the .WAV file by default. My method can be done after the sim run.
Your way actually adds a new column of data to the .WAV file. It must be done before the sim run.