code: def run(self, input_list: List[str]):
      input_list.append("extra_item")
      return {"mangled_list": input_list}
  
imports: from typing import List
  from haystack.core.pipeline import Pipeline
  from haystack.core.component import component
  from haystack.testing.sample_components import StringListJoiner
label_desc: Use image node_id 1 for calling the InputMangler obj's underlying member method code with example usage: obj.run(input_list) and returns: dict