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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.
What I found is to "close the latch of the hatch using a key or screwdriver/ random popsicle stick. Etc. If you have a third row like my suv, you can even put the belt buckle in it and have it hook before you snap the latch closed. Then to open it using the tail gate handle as normal. And you don't get an annoying warning beep because the latch is closed so the car thinks all is normal.
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.