[
  {
    "definition": "Targets, receptions, receiving yards, air yards, target share, and PPR production from up to four completed prior weeks.",
    "eligible_positions": [
      "WR"
    ],
    "feature_id": "trailing-wr-opportunity",
    "grain": "player-week",
    "leakage_risk": "medium",
    "missingness_rule": "Players with fewer than two prior appearances are excluded instead of imputed.",
    "name": "Trailing WR opportunity",
    "observed_at_rule": "Only regular-season player rows with week strictly before the forecast week are eligible.",
    "schema_version": "1.0",
    "signal_id": null,
    "source_keys": [
      "nflverse-weekly-player-stats"
    ],
    "units": "per prior appearance",
    "valid_max": null,
    "valid_min": 0.0,
    "version": "1.0.0"
  }
]