Use below format in your body section -

{ 
 
  "name": "Nightly model training", 
 
  "new_cluster": { 
 
    "spark_version": "7.3.x-scala2.12", 
 
    "node_type_id": "Standard_D3_v2", 
 
    "num_workers": 10 
 
  }, 
 
  "libraries": [ 
 
    { 
 
      "jar": "dbfs:/my-jar.jar" 
 
    }, 
 
    { 
 
      "maven": { 
 
        "coordinates": "org.jsoup:jsoup:1.7.2" 
 
      } 
 
    } 
 
  ], 
 
  "timeout_seconds": 3600, 
 
  "max_retries": 1, 
 
  "schedule": { 
 
    "quartz_cron_expression": "0 15 22 * * ?", 
 
    "timezone_id": "America/Los_Angeles" 
 
  }, 
 
  "spark_jar_task": { 
 
    "main_class_name": "com.databricks.ComputeModels" 
 
  } 
 
} 

and for header use below one-