you can study higgsas curve deform node group here (Higgsas) Geometry Nodes Groups Blender 3.1/3.0
Maybe you can adapt it to instances and you need to realize instances in order for them to deform.
you can study higgsas curve deform node group here (Higgsas) Geometry Nodes Groups Blender 3.1/3.0
Maybe you can adapt it to instances and you need to realize instances in order for them to deform.