I didn't get static IP for my airtel connection, but what I understand from other threads is PPPoE won't work once static IP is assigned.do not want to lose the ability to use multiple PPPoE on bridge mode
Also your account will be assigned with one IP, so it can't be used on both ONT and router as IP have to be unique.
So I think it is not possible to have multiple connections unlike PPPoE with the static IP.