Well I think I found the "selection's target" frame asset: target_vitals_backdrop_mini
It seems like there's some kind of background or overlay asset that we don't have access to though, because if you make that asset completely transparent it looks like there's some kind of partially transparent shading under the health bars.
And I think the assets like fellowship_burglar_20 are mini icons used to represent a player's class in your target frame when you select a player.
Still looking for a list of element and asset definitions if one exists. Thanks!
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