Hi all,
I was able to see that a support member was able to do additional testing to confirm that the current version of endpoint (V1 version), the call shown below, does not support variation level exporting.
https://a.klaviyo.com/api/v1/flow/FLOW_ID/action/NUMERICAL_ACTION_ID/email?api_key=****
However, our product team has noted that we do plan to support variation level data in V3 - however, we do not have a definite timeline as to when this endpoint will be released (expected V3 release for this endpoint would be Q3 or later in this year).
-Taylor