How to make Prefabs refer to each other?


I want to define my game levels using the amethyst Prefab system in .ron files. For this, I need my level Prefabs to refer to each other to allow switching between levels. There can be multiple references to each level, since they can have multiple entrances, so simple nesting is not enough.

Is there a way amethyst could support me with that? Has someone done this before? Is there a preferred way to load levels with associated data including level transitions in amethyst?