Save On Best Training Reward Callback

I am new to ray ralib. I would like to move from stable baselines to rlib.
My question: Is it possible to create a callback in rlib and save model on best result like it is done here:

@sven1977 what are the best practices here?

It depends on the problem. You should try and check if save best reward callback improves your model or not. Anyway, is it possible to do that with rllib as in stable baselines?