Sorting a RG based on a field of a field... of a field of a thing

Continuing the discussion from Sorting a RG based on :count list of dates:

@keith - sorry to tag you on a subject you tackled in so much detail already in the linked post. Just wondering, is there a way to sort by a thing of a thing of a thing. Specifically, my app has channels. Each channel has news feeds that it monitors. Each feed has a last_refreshed date. I would like to show in an RG the bots ordered by the dates of their most recently refreshed feeds.

To build on the hypothetical already set out in the linked thread - every date has a list of temperatures, and we would like to display the users sorted by the maximum temperature they will be exposed to in their concert escapades. I hope and pray that you and the beloved Petra (totally hypothetical, mind you) won’t top the list!

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