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I suspect this may not be possible, but I was going to suggest you open an actual Support case for this, to confirm, as we have some engineers who are more knowledgeable about the customization/API side of things.
I think you may have already opened a support case then, from the looks of things. Hopefully, they can get you an answer.
Yes, I've opened up a case with PTC.
I wasn't sure if they had an API and did not document it, or if there is no API at all to get the supersede info. Let's see what PTC gets back with. Thanks!