I think the only way, currently, is to use one of the artist fields (or even "Any field contains") and then manually look in the results if said artist is linked or not. Or at least that's what I do when I create a new artist and I'm looking for previous albums to link him. To find all of them, you might want to make 3 searches: one for the romanized name, one for the name in kanji, and another one with the name in kanji but putting a space between the first and lastname (remember to use quotes).
You can also combine it with the "No Artist Links" option since a lot of the time it can happen that none of the artists is linked, but you are probably going to miss some.
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