At this moment, we can use the variable 'job_metadada', but we cannot filter use the subset from this variable like `job_start`, or any other variable from the `job_metadata`.

At this moment we do have the following supported attributes, which we do have the `job_metadata` but we cannot use the sub attributes.{}

https://docs.redhat.com/en/documentation/red_hat_ansible_automation_platform/2.5/html/using_automation_execution/controller-attributes-custom-notifications

Customer is requesting the option to use `started` value from `job_metadata` at the notification.