RMAN Backup to Disk and to Cloud Parallel
Your local backup uses a disk channel. Cloud backup uses and SBT channel.
The same backup can not be duplexed to mixed kind of channels, see below.

Duplexing Backup Sets


  RMAN can duplex backups to either disk or tape, but cannot duplex
  backups to tape and disk simultaneously.


Even if you used an SBT channel for the local backup, that would require a media manager library that is different from the cloud SBT media manager library, which you again can not mix.

So the answer is no.

Just create some local disk backups, then backup the backupsets to the cloud.

About Multiple Copies of RMAN Backups


  Back up your files as backup sets or image copies, and then back up
  the backup sets or image copies with the RMAN BACKUP BACKUPSET or
  BACKUP COPY OF commands