数据准备求助：跨数据模型的“级联参数”怎么做联动？子参数下...

我想实现一个经典的级联筛选：下拉框选“大区”（如华南区），第二个下拉框自动只显示该大区下的“省份”。
我看社区里提到了在“数据模型”里的参数管理可以配置，但我的情况比较特殊：我的“大区”和“省份”是来自两个不同的数据模型（模型A和模型B），因为是不同业务线的人在维护。
我在仪表盘里配置了两个全局参数，勾选了联动，但在前端测试时，选了大区，省份的下拉框依然是加载全部数据，根本不触发过滤。
是不是跨数据模型的参数不能用系统自带的联动？必须得写宏代码，监听第一个下拉框的 OnChange 事件，然后用 setParamValue 去强制刷新第二个下拉框的候选值？求个能跑通的JS参考代码

谢谢
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