How to do NER with a BERT type models?

Hi, please help me with my question - I’m very new to using BERT based models 7 it’s the first time I’m doing this.
I want to get a disease tagger (NER) for some pubmed files I have converted to .txt format. I’m specifically interested in using BioBert or PubmedBert both of which are available in HF. However,
I think there’s no way I can accomplish this without fine tuning. But I do not seem to have any labelled data for fine tuning the models for my downstream task. Is there any way I could get around this? Please help.
Or maybe if any one knows of any other pre-trained models to accomplish this task?