No. What would you want to do with the Line-Out? 

Connect to an existing HiFi amp and speakers.  Will probably just buy the Port so.  Just thought it might be useful to have a stand alone speaker for use on a patio if such a product existed.  Thanks 

If such a speaker existed you’d presumably have had to detach it from the HiFi to use it on the patio. And put it back again afterwards. Rather inconvenient.

Sonos does of course have the Move and now the rather smaller/cheaper Roam for portable use. You might want to consider the latter.

An alternative option would be to hook a long range Bluetooth transmitter to the Port’s outputs and cart a Bluetooth speaker outside.