Hello Ashok,
TargetData elements are generally not stored anywhere in the logs because it's meant to insert dynamic values generated during a workflow execution.
But if you really want to insert them in the delivery logs , I guess a setup like this would work.
1>. Extend the broadLogRcp table to add the column targetData
2>. Enable the outbound transition of the delivery and attach the delivery to the update data activity.
3>. After you send the delivery using targetData , use an update data activity to populate the targetData field into broadLogRcp matching with each recipient
Please note , this will cause an extra INSERT query into the DB table which might impact the overall performance while deliveries are preparing.
Regards,
Adhiyan