How best to implement PGP file encryption with SFTP upload in Okta Workflows?

We've been using Workflows to set up various regular SFTP uploads and the latest one requires that the files be PGP encrypted before transmission. I have not found a way to do this in the existing functions of Workflows but I figure it's likely to be possible somehow. I'm hoping it wouldn't involve spinning up a custom server (not something I have access to do in my role currently) so if anyone knows of an existing method that Workflows can do for this I'd be very grateful. Thanks!