Stacking classifier in mlxtend have not attribute for transfer learning to get pretrained weights of own model. How to implement transfer learning?

Question

I have developed stacking classifier with DL models in mlxtend library and have trained it, now i want its weights for transfer learning but mlxtend stacking classifier have not attribute to got weights for transfer how can i implement transfer learning?

link of stacking classifier

http://rasbt.github.io/mlxtend/user_guide/classifier/StackingClassifier/