I think you could implement a Python script which merges all the adjacent token pieces in which there is a “##” char between them.
So for example (pseudocode):
tokenized_sentence = [[CLS], Hu, ##gging, Face, [SEP]]
for token in tokenized_sentence:
    if next_token in the sentence starts with "##":
        merge token and next token in one token

Unfortunately, I do not have a tutorial about this, but the solution could be implemented starting from this pseudocode.