I only have 10 days of history, you could create a sensor based on the those 2 entities with the correct device_class and state_class properties. You could monitor them in a database integration or you could add them as devices onto the Energy dashboard. All would give you persistent tracking.
They are rounded up to whole kWh values though. As are the other values reported by the app. If you want better accuracy you’ll need to go down the route of direct measurement with a CT clamp (£50 to £100) and/or heat meter (over £500 + installation) or an ebus circuit board wired into the ebus input on the heat pump interface (£50 to £100). ebus will give you additional data such as target temperature, compressor speed and a whole host more.
Have I understood correctly that these two entities are the total energy for the day, with each resetting each night?
Correct