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I've been in this situation a few times where I have something hanging out the hatch of a car. Often, there isn't really anything to hold the hatch down. But at slightly open positions like this, the handle for the hatch is perfectly oriented to clip a bungee cord on and hold it down.
Is this just a coincidence? Maybe. Still pleased me when strapping it down in the parking lot
I do wish there were actually a hook of some kind, though, for when it's significantly more open. Not that I've actually needed that.
how does that keep the hatch down?
You put the strap rope through the latch. And tie it off to the catch / the part where normaly the latch would hold to. Or use a seat belt like I do. Just gota pull it out all the way first.