Athena ICEBERG - Delete target rows while source rows doesn't exists

Hi, We're working on ICEBERG table and using MERGE INTO statement. We would like to implement the following logic:

1. In case there is match between some fields in source table on top of target table + there is changes in other fields: Update the target table with the source rows
2. In case there is no match - insert rows from source to target.
3. In case there is no match and there are records in target table that are not in source table delete this rows We succeed to implement steps 1 and 2 using below query.

MERGE INTO <...> AS target
            USING (
           <....>
            ) AS source
            ON  <....>
            WHEN MATCHED AND <>
		UPDATE SET 
			<...>
            WHEN NOT MATCHED THEN 
                INSERT <...>
		VALUES <...>	

However in order to implement #3 there was a suggestion to use WHEN NOT MATCHED BY SOURCE THEN DELETE However seems this is not supported by AWS ICEBERG.

Please assist with how we can implement it.

Thank you