...
id: The transition ID (Number).name: The transition name (String).from: The current status of the issue (IssueStatus).to: The target status of the transition (IssueStatus)hasScreen: true if there is a screen configured for this transition, false otherwise (Boolean)
To access the above fields for the current transition use Use the "Global Variables" tab of the Jira expressions editor . It shows expressions to access the current transition information.