If you look at the release page for the original emonPiCM software, and download the documentation, there’s a command to make the two currents available, on the LCD and on the Serial Interface.
However, I don’t know whether this has been retained in the later LowPowerLabs version. I suggest you try the command (‘c1’ for ON, ‘c0’ for OFF) and see what happens.
Unfortunately, no provision was made to send those values to emonCMS, though it could be added by customising the front-end sketch.