Dan,
Thanks for the pointer to the Driver. I installed it, and realized I dare not 'improve it' via 'capability "Power Meter" ' because I don't have any vintage of HEM.
I did read @rlithgow1 message and thought "I wonder if I can add yet another type of option to Better Laundry Monitor (BLM) and that seemed an interesting challenge.
BLM Challenge result
You can choose the Arbitrary Sensor option and then:
then pick the Arbitrary Attribute from the selected device.
then pick the Type to mimic.
I did place the BLM Child code where it could be picked up as 'Beta' but as it stands this minute, it's not a solution to @abuttino problem. They are not using BLM and even if.. the HEM driver uses a Switch attribute (on/off) vs a Contact attribute (open/closed) that BLM supports.