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exactly what tu as dit @Vince.
i think you can have up to 3 cables exiting the stem below the clamp, making it possible to supply both derailleurs, even without such bars with a stem hole.
Interested too as I am moving onto a Di2 setup!
Bars are stamped 42cm - is that C-C?
Looks like the junction box goes into the stem and the battery attaches to the fork bung - NEAT!
Video here:
https://www.youtube.com/watch?v=EnGAm46QpUk&t=225s