migration_via_sfdmu/prepared_steps/17_update_servicecontract/export.json

{
    "allOrNone": true,
    "objects": [
        {
            "query": "SELECT Id FROM ServiceContract WHERE IsTemplate__c = true",
            "operation": "Readonly",
            "externalId": "Id",
            "master": false
        },{
            "query": "SELECT Id, TemplateId__c FROM ServiceContract",
            "operation": "Update",
            "externalId": "Id",
            "useSourceCSVFile": true
        }
    ]
}