code: def run(self, a: int, b: int = 2):
      return {"c": a + b}
  
imports: from pathlib import Path
  from haystack.core.component import component
  from haystack.core.pipeline import Pipeline
  import logging
label_desc: Use image node_id 1 for calling the WithDefault obj's underlying member method code with example usage: obj.run(a, b) and returns: dict