A mesh proxy is created to enable the features of mesh objects (shape keys, physics, rigging, mesh modifiers, etc.) to be used on hair curves. Geometry nodes update the shape.

What does it do?
This addon combines the best features of hair curve and mesh objects.
Shape keys and hair dynamics can be added to hair curves in just a few clicks.
Use shape keys to create alternate hair styles, tweaks, or even perfect loop animations.
Want your character's hair to fall naturally behind the shoulders? Sculpt a rough shape, enable hair dynamics and let Blender do the rest.
Want to make sculpted adjustments after simulating hair dynamics? Hit Apply to Sculpt and you're good to go.