There's nothing similar, but oculd be planned for some future.
As sides can have completely different sizes and BG/FG images, the only way would be to import items similar to how general templates works. In case of very different size in sides that would result in some distortion, while it would not in case of both (or similar) sizes in sides (now, try to read this whole sentence out loud, if you can!
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Important point is there's really no room to plan something similar in the near future though. Could be planned as I said, but no timing can be provided right now.