There are rappelling set ups the ski patrol carries to lower themselves and their avalanche dogs out of the lifts so they can help with any lift evacuation. Get some training before you attempt
anything.

The one I used was a 6mm climbing cord, a locking carabiner and a piece of webbing to make a swiss seat. This was 25 years ago so
protocols may have changed.

Practice first on a short safe overhang till you find the correct
munter hitch or carabiner wrap that produces enough friction.

Don't leave the rope dangling from the chair after an evac or you
make cause more problems for other stranded persons when they get
the chair moving again.

A cord this thin will easily cut over an edge, so be sure to use a
smooth attachment point to double the rope over.