code: def _process_field(self, node, field, value):
      if isinstance(value, list):
          for index, item in enumerate(value):
              if isinstance(item, ast.AST):
                  self._process_child(item, node, field, index)
      elif isinstance(value, ast.AST):
          self._process_child(value, node, field)
  
imports: import ast
label_desc: Use image node_id 3 for calling the ParentChildNodeTransformer obj's underlying member method code with example usage: obj._process_field(node, field, value) without return types