How to access tree level predict using FastForestRegressionModel in ML.NET?

Question

I trained FastForest regression model with 200 trees, need to generate predict distribution by tree level predict. This can be easily done in python scikit-learn random forest model using each estimator to predict. In VS debug, I can see the TrainedTreeEnsemble under model.LastTransformer.Model, but no interface for calling individual tree to predict. Please share any inside you have. Thanks.