Inav telemetry setup for flight battery sensor

[ssjimh]

My Omnibus F4V3S Plus flight controller appears to be sending Vcc voltage (5.0V) telemetry on both A1 and A2. My Radiomaster Pocket (Edge TX) telemetry page shows A1 and A2 to always be he same value. With the FC connected to USB they both show 5.0V, with flight battery connected they both show 5.2V.

In Inav configurator 7.1.2 how do I configure telemetry A2 to be the flight battery voltage?

Thanks!