How to target ReferenceSetSelector for design properties

I’ve used the described name from the model skd page: See below, but I don’t see the propery for the ReferenceSetSelecor. The name to target the widget doesn’t seem to be correct.  A’m also unable to find the widget in the wigetfolder to find the correct targetname   "ReferenceSetSelector": [         {             "name": "Material Icon",             "type": "Toggle",             "description": "Set an material icon for the button",             "class": "material-icon"           }     ]
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