code: def _prop_descriptions(self):
      return """\
          marker
              :class:`plotly.graph_objects.choroplethmapbox.unselecte
              d.Marker` instance or dict with compatible properties
          """
  
imports: from plotly.basedatatypes import BaseTraceHierarchyType
  import copy
label_desc: Use image node_id 3 for calling the Unselected obj's underlying member method code with example usage: obj._prop_descriptions() and returns: str