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This is not supported right now.
A semi-manual way could be to write a short function that takes in a JointTrajectory, reverses the order of the JointTrajectoryPoints in it and then re-runs the time parameterisation.
One reason I can come up with for why this isn't directly supported (apart from 'no one' needing this sort of functionality badly enough to add it) would be that it's quite an assumption to make that the environment hasn't changed between planning & executing the "to" motion and the time you'd want to make the "return" motion. As MoveIt is primarily intended to perform motion planning in dynamic (or at least not in completely static) scenes, reusing trajectories does not seem like something that would be often done.
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