code: def list_append(self, list_, x):
      list_.append(x)
      list_ = TestList(list_)
      return TestList(list_)
  
imports: from nvidia.dali._autograph.converters import directives
  from nvidia.dali._autograph.converters import lists
  from nvidia.dali._autograph.core import converter_testing
  from nvidia.dali._autograph.utils import hooks
label_desc: Use image node_id 5 for calling the OperatorList obj's underlying member method code with example usage: obj.list_append(list_, x) and returns: TestList