Hi did you find a good way to do it? I have found this way however,
TEXT = data.Field(sequential=True, tokenize=tokenizer, lower=True,fix_length=200,batch_first=True)
with open("model/TEXT.Field","wb")as f:
     dill.dump(TEXT,f)

from  https://stackoverflow.com/questions/53421999/how-to-save-torchtext-dataset 141