Exposing the tree for multiclass classification

Hey.

We are currently porting our Code from the Accord framework to ML.net and struggle to do so. In the Accord.net framework we are using the C4.5 decision tree algorithm to process our data and so we were looking into multiclass trainers from ML.net.

With Accord.net we have the ability to inspect the trained tree and expose this via text form to the user. Are we able to get the same information with ML.net?

After reading into #4275 we are actively looking into the LightGBM trainer, but I am only able to find the trained tree ensemble for all the other options except the multiclass classification version of LightGBM.