In your image, your preconditions are declared as Objects, not as Arrays. You would access them the same way you access the choplog object.
Did you look at the example I uploaded? It shows the use of the path. Basically, using the example you showed, I looped through the actions. In the loop, I use JSon.Path to reference which object the loop is currently looking at. To get the sub objects of the choplog object, loop trough the entries of choplog and use JSon.Path. The path to the preconditions would be Actions.choplog.preconditions.