[google-cloud-sql-discuss] Backup restore to different instance, in different project

I'm failing to restore a backup from a source instance to a target instance when each instance is in a different project.  Is this simply not supported ?

I get ambiguous permissions error from the target instance restore cmd**.   Also if I look in the console no option is offered to target instances in diff projects,  resonable I suppose for thr console.  

I guess unless you can pass a project in the restoreBackupContext json, as below, this isn't supported yet ?

  

**  below from https://cloud.google.com/sql/docs/mysql/backup-recovery/restoring#restorebackups   

curl --header "Authorization: Bearer ${ACCESS_TOKEN}" \
     --header 'Content-Type: application/json' \
     --data '{ "restoreBackupContext": {"backupRunId": "[BACKUP_ID]", "instanceId": "[SOURCE_INSTANCE_NAME]", "kind": "sql#restoreBackupContext"}}' \
     -X POST \
     https://www.googleapis.com/sql/v1beta4/projects/[PROJECT-ID]/instances/[TARGET_INSTANCE_NAME]/restoreBackup

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