how to pass a list in formOutput

I have a bdm with name approverLevelsInfo and attributes 

 

levelOfApprovers--integer

approvers--string Multiple

minMaxInfoId--integer 

how can I pass the list in form Out.I have tried below code but it shows errors

 

approverLevelsInfoInput :
    {
        approverLevelsInfoInput.each{
            approverLevelInfoList.add({
            minMaxInfoId :  $data.checkMaxno,
            levelOfApprovers  :  $data.formInput.levelOfApprovers,
            approvers  :  $data.formInput.approvers  
                    })
              }
    }

Please suggest 

Hello,

This question is in double, could you mark this one as "answered"? 

Best