Journal Datastore set to Auto

Is there a way to set the journal datastore to Auto? All of our GUI built VPGs are set to auto. However the API fails when the DatastoreIdentifier is set to anything other than a valid identifier.

https://zvm_ip:port/v1/vpgsettings

“Journal”: {
“DatastoreClusterIdentifier”: “########-####-####-####-############.group-p######”,
“DatastoreIdentifier”: null,
“Limitation”: {
“HardLimitInMB”: 153600,
“HardLimitInPercent”: null,
“WarningThresholdInMB”: 115200,
“WarningThresholdInPercent”: null
}