How to update parent story's original estimate with sum of subtasks in team-managed project?

[Anna Laptyuhova]

Hi community,

I'm trying to roll up subtask original estimates to the parent story automatically in a team-managed Jira project.

What I've already tried:

1. Edit work item → Additional fields JSON

json

{ "fields": { "timeoriginalestimate": ... } }

Result: field ignored — timeoriginalestimate not available in team-managed

2. Edit work item → timetracking JSON

json

{ "fields": { "timetracking": { "originalEstimate": "..." } } }

Result: edits the subtask itself, not the parent — no "Parent of trigger work item" option in team-managed dropdown

3. Send web request PUT to REST API

https://mysite.atlassian.net/rest/api/3/issue/{{triggerIssue.parent.key}}

Result: 404 — smart value doesn't resolve in URL field

What I need:
When a subtask's original estimate is updated → calculate sum of all sibling subtasks' original estimates → write total to parent story's original estimate field → visible in backlog without entering each story.

Questions:

• What is the correct smart value for parent issue key in Send web request URL?
• Is there any other approach (branch, lookup, etc.) that works in team-managed?
• Does triggerIssue.parent.subtasks.originalEstimateSeconds.sum work in team-managed at all?

Thanks!