Connect:Amp and volume control for subwoofer output

I recently purchased a connect amp and have it powering 2 in ceiling episode speakers and an in wall sound bar. I just added an svs sub which is connected via the subwoofer output on the connect amp. It sounds amazing, but I cannot find an option to adjust the volume specifically to the sub or even an on/off button for the sub through the sonos controller app. Does this exist? And if not, it seems like this could be an easy update for the amp software. Thanks.