Is there a way to pass list of eff values in Item rule to an underlying global function call

Summary: We have requirement to validate duplicate values selected in multirow eff. Our criterion to check duplicates is based on first four characters from the eff value (e.g., INT-%). Hence, we cannot use item rule inbuilt unique check. Therefore, we are using a global function with groovy to validate.

But to validate them, we need all selected attributes to be passed to function in input parameter as list/array. Is there a way we can achieve this with item rule. Like [[Item].[Category].[attribute]]. Item rule accepts only String or Object type input parameters, it won't accept Lists

Content (please ensure you mask any confidential information):