just a suggestion as it would result in much cleaner jsons, but the "condition" key should probably be one of the few reserved keys for the Multiple power type, just like the "hidden" and "type" keys are

and if it is already, it may be worth updating the docs
https://origins.readthedocs.io/en/latest/types/power_types/multiple/

The condition (and many other) key(s) is actually already reserved for a long time. Just need to update the docs, whoops