Nope it is not meant to rise. The coupe and GC have traditional gooseneck arms with springs and/or gas struts attached to them. The convertible boot lid is hinged where the soft-top lid meets it. There was no way for BMW to automate it.
Interestingly the S-Class Cabriolet has a similar trunk setup and it has an auto tailgate. I thought about attempting a retrofit but quickly abandoned the idea due to cost and technical/cosmetic challenges
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