Contract Import to CLM

Hello,

I'm trying to import contracts residing outside of SAP Sourcing. I've prepared the meta template and tested for import. The contract data is being imported and contract documents are also attached to the respective MA. My question is how do we import executed contract into 'Final Signed Document' field under Contracts tab.I understand that it is collection field and this field/column is not present in the load file.

Thanks

Shilpa