#BusinessData

Select/Dropdown referencing in a repeated container

I have a repeated container based on the contract input.
Inside the container has 3 dropdown/select objects.
I created 3 variables, type : business data.
The problem is the filter the query value should come from the value of the other select/dropdown field (e.g. $item.region_id)
I tried something like this => {{formInput.OfficeRegion[$item.region_id]}} but it doesn't work.

How can i apply this in the repeated container?

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