No. 
 

It isn’t mentioned here:

https://support.sonos.com/en-us/article/set-up-your-sonos-sub

You could split the Pair and put one Sub on each.

“Some Sonos home theater speakers can connect with up to two Subs.”

That only applies to soundbars. 

FYI, splitting the pair will require you to set up a separate room for each speaker ( even though they are physically in the same space). You’ll have to group them together to play as one. You can setup a permanent group in the app. Doing the above will no-longer be true stereo separation as both speakers will play left and right channels. If you use Trueplay you’ll have to do it separately for each speaker or just use Auto tuning for both rooms..