Use case
Return the display name of the previous reporter.
Expression
Create and configure a Smart field using this expression in Jira Expression parsing mode:
let reporters= issue.changelogs.map(i=>i.items).flatten().filter(i=>i.field=="reporter");
reporters.length>0 ?
reporters.map(a=>a.fromString)[0] == null ?
""
:reporters.map(a=>a.fromString)[0]
: ""
