Yes, they were placed there just for that reason. Good enough to change a tire out or something along those lines.
The torsion bars divide the vehicles weight amongst themselves, with tires on the ground, but using that hook for support, only one LCA bushing (not the torsion bars, as the tires are off the ground) is taking all the weight.
I wouldn't use them for anything long term tho. Better to use the frame itself behind the front tires / behind the bumper, with good jack stands.