Door lift assist for floor jack?

I'm at the point where I'm going to need to take the doors off and on occasionally and working by myself, it is a PITA. They really want to tip over when just balanced on top of the jack. I'm looking for ideas, pictures, or vivid descriptions of an assembly I can use with my floor or transmission jack that will reliably hold the door in position while I zip the hinge bolts in. Some level of fine adjustment might be desired. I've used a temporary bracket made of wood but it was sketchy...

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Author: gzig5