No, with a Port you need to use the active amplifiers in your (excellent) speakers. Port is great to use with B&O speakers - since Port also has a power-out, which you use to fire up the Beolab amplifiers. I have 4 Beolab 6000 connected to two separate Sonos Ports and it works beautifully.
Get one of these cables https://www.av-connection.dk and you are all set. Or, if you can, make one yourself.
There is only one issue and that is that the power-out on the Port is 12V and B&O speakers really only need 5V to switch on the amps. If you REALLY want to be on the safe side you can reduce the 12V to 5V with a 5V linear or buck regulator, which is not hard to do. Alt. have someone help you. I have not done this in my setup, but I know that I probably should...
One more thing: you cannot use a Port in a 5.1 or so setting so you are stuck with 'stereo'. Disappointing, but Sonos doesn't want to make it too easy to use non-Sonos speakers, I guess. It might also be a latency issue. Anyway...
Good Luck! / U