[
  {"op": "doc", "text": "open EMA smoother pattern: exponential moving average over an injected price input role"},
  {"op": "input", "role": "price"},
  {"op": "add", "type": "EMA", "name": "e"},
  {"op": "feed", "role": "price", "into": ["e.series"]},
  {"op": "expose", "from": "e.value", "as": "smoothed"}
]