Reading Aux battery voltage from App when not charging

Have an Orion DC-DC 30 charger connected to the D+ terminal on my Sprinter to only charge when running which works great.
Not sure why the App only shows the Sprinter input voltage when engine is off and not both voltages. Using the App to track both batteries to watch the discharge rate seems like a no brainer!
Did I miss a setting or can this be added in a future release?

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