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I will say upfront that I don't actually know the answer to your question. However, most modern cars are like that. The camber is a function of the weight on the rear axle and the strength of the springs. That's why you see so many "souped up" Hondas with the rear tires all ****-eyed. As the rear end gets lower the tires roll on the inside edges. There's no way to correct for that.
Fortunately, camber only has a minor affect on tire wear. You're only 0.1 degrees out of the specified range. That 0.1 degrees is negligible. A few pounds of weight in the trunk could cause it to be 0.1 degrees off.
There is no specific camber adjustment in the rear however other tweaks in the alignment can have an impact on rear camber, as well as ride height, but as noted, yours is of no concern for tear wear.