Is it possible to train reformer for q&a with existing pretrained models

It is possible to train reformer for questions answering using pretrained model ‘google/crime-and-punisment’ or ‘google/reformer-enwik8’? Because I looked at some issues at github like this Squad2 processor error · Issue #5436 · huggingface/transformers · GitHub and I am not clear if it is even possible without optimising code much