Parameter contrib_prediction_col for SparkXGBEstimator

I’ve been using sllynn’s Python wrapper for XGBoost4j and obtaining feature contributions via the contribPredictionCol argument.
I now want to migrate towards the official Pyspark XGBoost support (especifically using the SparkXGBClassifier class), but I can’t find this parameter anymore. Is there any way to access it? And another question: is there any official documentation for the Pyspark version? I can only find the one here but it’s not what I need.