As far as I know the Phoenix can’t measure/show the AC consumption.
You could activate the option “Has DC System” in the System Setup in the VenusOS. Then you should at least see the DC load of the shunt.
The other and clean way would be to install a AC Meter at the output. Could be something small and cheap like a Shelly 1PM (~15€). This you could integrate into VenusOS and display it in VRM. My only concern is, I’m not sure how this will work without an Multiplus…