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Is this the half hitch knot you mean?
Similar idea: an S-hook from an upper door hinge (pin-side) as noted above, you need conveniently located doors, plus, while in use the door can't beWalksIn2Trees Today, 20:36
Some doors and frames are sturdy. They are rare. Most are among the weakest part of any home.
Do this with great care ... and as always,