Is there a way to input my home cost for kWh into the app so it can total my costs like it does for public charging?

Yes.
In MMe find the button "My Charging Stations"
Click it and then click the button "Add charging station"
When you do this, you will find that you can add parameters like charging speed and cost per kWh.

Thanks Scott.
Turns out I did have the price loaded, but it’s not calculating total cost..
any thoughts?

I'm not near my car so I can check now, but I think there's a place IN your car where you need to identify/select your home charging station. I believe by GPS coordinates.
I assume this is how the car knows it should calculate totals.

it’s working properly and rolling up the costs. I just realized I am sharing this charger with a Porsche S eHybrid and reporting its usage for both cars and only costing out the EQS.