How to specify the llm span in tracing langfuse

[shaking54]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

I have a workflow, there are many llm blocks in the workflow. How can I specify the llm block I want to trace or judge by llm. This because I see all the block llm are used the same name instead using name of block in dify when tracing by Langfuse.

2. Additional context or comments

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