To do this, you need to know what kind of battery the electric bike uses and what its power consumption is so you can compare it with the power bank.
I have seen that someone has answered this question and is willing to test it, perhaps then you can report back. Unfortunately, we are not able to provide you with this information. You can always send us a detailed e-mail to galaxus@galaxus.ch.

Hi I don't think it's sufficient for charging eBibe actually I've never tried it but it certainly charges a LapTop. I use it for testing internet routers where I don't have power and I always take it with me on camping trips to charge tablets and smartphones. I hope it was useful and if you want I can try charging my eBike and then tell you.