Thank you everyone! I chose Paul’s answer because although Alex’s answer has more info right in the reply, that documentation doesn’t state outright that you can return a list of lists (even though that is what the example code does). The Forms whitepaper specifically states that it can be a list of lists, gives an example of the list structure for a hard-coded set of AllowedValues, and then says that you can also return a list-of-lists from an AllowedValuesDefinition. It’s just a bit more obvious that this is documented behavior.
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