Adding special tokens to tokenzier and then expanding the embedding layer

[smadeyan]

I have some data where I've introduced some new tokens (Eg: ), and I'd like to add this to the tokenizer for the llama-2-7b.
Can we do this using llama-factory? I can see the open to resize token embeddings in the UI (under "Extra Configurations"), but I'm not sure how to add the special tokens in the first place. Can someone please help?