Backing Up to Azure Blob Storage with SQL Safe

[dbajeremy]

I would like to leverage the speed and compression of SQL Safe backups for our local SQL instances, but send the backups to Azure Blob Storage. I have no problem writing native SQL backups to Azure, but when I add the @backupsoftware = 'SQLSAFE' parameter, I get the following error:

Msg 50000, Level 16, State 4, Procedure dbo.DatabaseBackup, Line 2278 [Batch Start Line 27]
The value for the parameter @url is not supported.

Is it not possible to use the DatabaseBackup stored procedure to backup to Azure using third-party backup software?