[Feature] 变量聚合：希望添加一个选项，可聚合为 `dict` 类型数据（只是这 key 得添加一个输入框进行设置了。

[wangliang181230]

MaxKB Version

2.6.1

Please describe your needs or suggestions for improvements

Please describe the solution you suggest

No response

Additional Information

No response

[baixin513]

感谢反馈，后续可以考虑聚合为dict类型

[wangliang181230]

@baixin513 see #4907