Claudio Silva explains how you can provide secure access to manage SQL Agent jobs:
It is common having services accounts that are job owners so they can run within the proper context.
In my humble opinion, this starts to be a little strange when it comes to modifying the agent job. It means that the service account needs permissions on agent roles and someone will need to connect to SQL Server using the service account (run as) so they can manage the agent job. It works, but not practical.
It’s not trivial, but there are roles and you can add a bit of extra code to help.