About new task and special token

[lluo-Desktop]

Hi,
I want to finetune on a new task , so I will prepare my data like :
category<loc_x1><loc_y1><loc_x2><loc_y2>category<loc_x1><loc_y1><loc_x2><loc_y2> ...
I'm confused with spec token. Need I add as special token to tokenizer?
I find that just dataset and trianing code added for finetuning on new task .