Create shared JMWE post-functions (or sequences of post-functions) that can be reused in multiple workflow transitions.
In Jira Cloud, JMWE post-functions (or sequences of post-functions) can now be configured once and then added to multiple transitions across different workflows. It lets you quickly reuse (and then maintain) common configurations. For example, set multiple fields using set field value post-functions and then add them to transitions as one Shared Action, without the need to recreate them again and again. Or configure a post-function to send an email, and then reuse it in different workflows.
In the Shared Actions page (see above), combine one or more JMWE post-functions into an action. Then, use the Shared Action post-function to add it to various transitions, even in different workflows.