There are REST API to update a Service Owner in a ITSM project

[Marco Raminelli]

We have a lot of service projects, everyone associated to a service. To avoid manually change the owner or the stakeholder when people change in the projects, we would like to create a script runner automation to update these fields, something like

PUT /rest/servicedeskapi/servicedesk/{serviceDeskId}/service/{serviceId}

{ "stakeholders": [ { "accountId": "account-id-of-stakeholder-1" }, { "accountId": "account-id-of-stakeholder-2" } ] }

and 

GET /rest/servicedeskapi/servicedesk/{serviceDeskId}/service

to get the list of services

[Sandro Leone - EPS]

Are you by chance maintaining these services currently in your Assets (part of Jira Service Management)?

If yes, you should be able to set the owner as a user-attribute on the object and keep it up to date with an automation rule.