On Prem SQL Server: Log shipping via Azure Blob Storage: Possible?
Yes, but only manually - Azure Blob Storage isn't integrated into the log shipping wizards. You would need to do your own backups to Azure Blob Storage, and then have the secondary server(s) restore from ABS using the same certificates. 

When other shops have done similar projects with AWS's S3 storage (writing their SQL Server backups there using 3rd party tools), I've seen them either log backups to a text file that the other SQL Servers check for backup files, or log entries into a centrally accessible table (like SQL Azure or Amazon RDS) and fetch the backup file names from there.