How to find important features from GBT?

I have built a GBT model (not H2O GBT) on my dataset. How do I find which are the important features which the model has found?

Please help

@somnathdas76 if not the H2O Gradient Boosting Machine Learner – KNIME Hub then you might enlighten us as to which model / node you actually used. Best would be a sample workflow that shows how the model works without spelling any secrets.

if you used python then scikit provides the feature importance on the trained model.