TPV understands and plays .zwo files perfectly. This means TPV can already handle the <FreeRide> and <Ramp> instructions.
However (as a coach) you normally create workouts with the TrainingPeaks WorkoutBuilder and have the athletes export them to the desired platform. Which is not even necessary with TPV.
Unfortunately I have no way to mark an interval as "FreeRide" in the WB. This is necessary for all forms of tests e.g. FTP, max. efforts, etc., and "Ride by feel" sections.
Not as much important are ramps. While we have fixed step intervals in the WB it would be nice to have a ramp that continuously increases/decreases intensity over the length of the interval.
So this more a suggestion for the TP Workout Builder, but must be driven by TPV.