Flux.1-dev lora training not support trigger word parameter？

Hello, I have a question for you.
When I use flux_train_network.py to train flux lora, I want to pass the trigger word parameter, but I found that this parameter is not exposed in the code. I want to know whether the trigger word parameter is already supported and I just didn't find it, or whether the trigger word parameter is not supported at present? If it is not supported at present, when will it be supported?
Thank you

Start with flux_train_network.py and trace how training options are parsed and passed into Flux LoRA training. Determine whether a trigger-word parameter already exists and how it is used; done means providing a definitive answer or a clearly scoped support request with its expected behavior.

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