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The manual states, "In the vehicle, only charge the battery via the starting aid terminals, refer to page 247, in the engine compartment with the engine off."
It does not say to charge directly via the battery terminals in the trunk. That would bypass BMW's IBS (intelligent battery sensor) and you don't want that. There might be safety reasons as well. Also, I don't know of any plug to charge the battery.
Reference: 2019 M2 Competition Owners Manual
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