code: def _add_default_options(self, **options):
      new_options = self.kwargs.copy()
      new_options.update(options)
      return new_options
  
imports: import unittest
  import pytest
  import numpy
  import traitlets
  from ..marker import MarkerOptions, Marker, Markers, Symbol, marker_layer, symbol_layer
label_desc: Use image node_id 2 for calling the MarkerLayer obj's underlying member method code with example usage: obj._add_default_options() and returns: new_options