All of my HomeKit outlets have this. It’s weird that yours don’t.
One thing to try is to change the outlet to a light (it asks when you set up an outlet if it’s a light or not) and see if the turn off after control returns.
Fwiw, I have the same issue with a dehumidifier and I use a HomeKit Eve Degree device which measures humidity levels. I have one automation that turns on the outlet when humidity reaches 80% or more and turns it off when humidity reaches 74% or less. But I need something like this rather than NFC tags because I’m only there a couple months every year. If I had one gripe at all about using Eve Degree it’s that it’s a battery controlled device that needs a new battery once a year or so. I wish they had a model that could be plugged in.