You could set up a profile for just HV miles, one for just EV miles, and another for both.
The real issue is making sure the dash display is actually what you think it is. The HV to EV ratio is actually what you think it is; the ratio of what mode the car is in. The new Prime on the other hand reports anytime the ICE shuts off as EV miles. So the EV percentage includes electricity used from the grid and made from gasoline.
The other thing is that the dash display is likely using how electricity was used from the battery for calculations. Because of charging losses, that isn't the electricity that was put into the car. You need a Kill-a-Watt on the EVSE that came with the car, or a level 2 EVSE that tracks kWh used. The EPA numbers assume an average charging loss from a level 2 unit.
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