I came across this, which is your question
You have to read the comments but the two most important ones are from an EE and a director of machine learning of a utility company. From the EE, ALL electric devices have signatures. They KNOW the signatures. Just imagine a big data base in the sky where every device has certain characteristics, it's signature. The Machine Learning director, yeah, but its not there yet, not mature. Written a year ago. Why do this? Load balancing. We all know electric is on demand. Thats why wind and solar sucks compared to hydro or fission. But basically an unlimited source, all the time, unlike for hydro or if splitting atoms. Now read
www.eia.gov
The smart meters are two way. My
utility company offers incentives to shut your AC down in the summer during peak loads. Thats a VERY bad idea around here. Its the humidity, not the temp, but that is how pitiful the grid really is. Do you want a monopoly, electric, to control your devices in the house? The grid cannot handle things NOW, never mind adding a 100 X as much load for all EVs, that's just nuts. Not going to happen. We know it, they know it, everyone knows it. So? What to do? My house didn't even have a circuit for a Microwave. They NEED to expand everything. But DATA is everything.
But that's not good enough, along comes this guy, 2016, there's an App for that
Sense's consumer app makes homes smarter, empowering people to make better use of their energy, lower electricity bills, and reduce their carbon footprint.
sense.com
For a mere $300, your smart phone can tell you exactly what devices take your electricity. This is on the consumer. Not buying it. I don't need no app to tell me my bill goes up when the hot water goes on. Like duh. Some verbiage
Sense’s $299 gadget identifies individual devices in the home and exactly how much electricity they are using.
www.technologyreview.com
But that's doesn't help the power company. Read
The Determination of Load Profiles and Power Consumptions of Home Appliances This is some really scary stuff in here. They can know when you opened your refrigerator door!!!!

Thats freaky. They know EVERYTHING, but that's still not good enough, cause it needs sensors.
Enter ...
"Non-intrusive Electric-vehicle Load Disaggregation Algorithm for a Data-driven EV Integration Strategy"
Gotta love these names. Yes, they are hunting down EXACTLY what EV chargers are doing by reading the smart meter usage. and

You gotta love modern technology. Of course they can find your charger. So is this being used? Oh yeah, its coming. Lets take a look see at CO, their pilot program. You have to love their names too. Disaggregation? What a great name for "ripping apart your smart meter usage and determining who is using an EV charger!"
Electric Vehicle Load Detection and Disaggregation Pilot
And you think you are going to hide your L1 charging? 😂 Guess again. Quote:
"Detecting the EV level of charging speed – i.e. – level 1 (L1), level 2 (L2), possibly level 3 (L3) charging speeds"
More interesting, here is one of the comments, from a company complaining, HEY, USE MY SOFTWARE! 😃
Sure enough, there are companies that already do this like Sagewell
EVFinder Advanced AI and Machine Learning
I bet you thought I was joking about hunting down your EV. Nope. Gotta love their name EVFINDER 😅 There are others like Bidgely
AI-Powered EV Detection and Estimation Helps Utilities Realize the Promise of the EV Revolution These are not sold, AFAIK, to consumers but are B2B so chances are you will never hear of them. Technology moves faster and faster, a few papers on this
AUTOMATED DETECTION OF ELECTRIC VEHICLES IN HOURLY SMART METER DATA
A Deep Generative Model for Non-Intrusive Identification of EV Charging Profiles
Just like the hardware in EVs is in its infancy, the ability to determine if your EV is charging via AFI meters is also in its infancy, but its necessary to load management. Its coming, and they WILL know exactly how you are charging, how much, and how long. There will be a data base of electronic signatures. And once they got that data, what's next? 🙂 its all about supply and demand. If there were 100% penetration of the vehicle market, all ICE gone, all fossil usage gone, you must know they will get what the market will bear. They will hunt down and track your charging because its takes up too much of the available bandwidth.
See they aren't going to cut off your heat in the winter, but they can certainly increase your rates for charging a car.
They are telling you that the technology exists NOW, its in the innovative state, they EXPECT to use it in the future. Pay attention, they are telling you 😀
You will not be "hiding" your EV charging among other electric devices.