工作流增加插件失败，报错：Unknow variable DTO:list:number

**Describe the bug**

插件成功发布，配置输出参数的时候，层级是array.array[i].array会在工作流中增加时候报错，报错信息如题。

**To Reproduce**

Steps to reproduce the behavior:
1. 增加插件
2. 配置返回参数格式示例：{
"A": {
"B": [
{
"C": [
0.1,
0.2,
0.3,
0.4
]
}
]
}
}

**Expected behavior**

正常增加插件并且正常运行

**Screenshots**



**Version:**

最新代码docker部署

**Environment:**

The output of `go env`.

**Additional context**

Add any other context about the problem here.

Start with the workflow path for adding a plugin and configuring its output parameters, then reproduce the nested array and array example from the issue. Trace where the DTO:list:number variable is generated or resolved; done means the plugin can be added and run successfully with the shown output structure.

Written by the indexing model from the issue text.