Question about decoy outputs

full image - Repost: Question about decoy outputs (from Reddit.com, Question about decoy outputs)

As far as I understand, any output can be selected as a decoy when somebody constructs a transaction and it's impossible for an observer to know which one is the real spend. Is it possible to see how many times each of your own outputs have been used as a decoy? Not in the GUI wallet for sure since you can't even see your outputs, but maybe in the CLI? Or feather?

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