Problem: You would like to send a notification email to a manager when his or her approval is needed similir to an email generated by JSD standard notifications.
Solution: NB! This solution works on Jira 8 only.
Create a new Raley notification configuration that should be fired when your workflow is transitioned to the step that requires approvals. Something like the following:
In the TO section choose Approvers and add the following code to the message template:
Note, that the custom field referenced on line 5 could be different in your instance. Here's how you find it: