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About the question, what could be done is to use the node template index field based on which it would be possible to get the desired parent element or elements of the current node by calling the itemLookup() function. Indeed, the provided index would have to be split accordingly using some custom logic in order to find the desired parent node. But there isn't another built - in feature that would allow to achieve the requirement at the moment.
Please let me know in case any further information is required for this case.