In Actions for Jira Serivice Desk section, click Workflow Actions. In Add or Edit transition section, select Edit transition from the appropriate workflow. If you want, you can change the Display name of the transition visible in Customer Portal. Select Fields & Custom Fields which the user can edit on the transition. Tap Add to save the setting.
A simple example would be: {"value": 3} However, this value can be dynamic. If it comes from a Smart Value, it typically will be. That is the entirety of the first rule. The second rule is only slightly more complex: Trigger: Incoming Webhook. The URL this provides is used in the Send Web Request for the 1st rule.In your service project, go to Project settings > Workflows. Select the pencil icon beside the workflow that has the transition you want to add to the portal. Select Diagram to open the diagram view. Select the transition in the workflow, and check the box beside Show transition on the customer portal.
If you copied the system workflow and you wish to rename the workflow transition buttons on the View issue page, you must delete the following properties from all transitions in the copied workflow: jira. i18n. title; jira.i18n.description; Otherwise, the default names (i.e. values of these properties) will persist. Read more about transition