As Matter is starting to come to HA my hopes are high.
But as stated in the OP, it is not to just switch this thing on and off (this is already doable), it’s about a live reading of the power consumption.
At the moment it seems, that this data is only collected within the eve energy and then also only accessible via the EVE app and an established direct connection (not working in Apple HOME).
So i think it is part on EVE to push/publish this data via Matter. But we will see… Fingers crossed 