### What this PR does / why we need it?
The detail has been clarified in that issue :
https://github.com/vllm-project/vllm-ascend/issues/2557
### Does this PR introduce _any_ user-facing change?
NO
### How was this patch tested?
easy to test beacause we just need to echo the variable
- vLLM version: v0.10.1.1
- vLLM main:
6997a25ac6
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Signed-off-by: zzy-ContiLearn <1831242919@qq.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: LCAIZJ <leichao139636@163.com>