VFXPropertyBinder how to add properties by script

I have a VFXPropetyBinder with two bindings set through the editor, each with a property name and a target, one is a SphereCollider the other a Transform.

I need to change these bindings to bind to different object through script and I am not sure how those binding relate to the AddPropertyBinder<VFXBinderBase>(); of the VFXPropetyBinder object.

I am missing something obvious Can someone shed some light, please?

 

Bump please, I am also finding it really difficult to learn anything on how to set property binders via script.