When raise a "Request a change" with "affected services" and status go to "AUTHORIZE", the Approvers field will be auto updated by "Automation for Jira". But I didn't find any automation rule for this behavior.

For a custom request type based on "Service request with approvals" issue type, this function doesn't work.
I tried to use automation rule with "Edit issue fields" and smart values like "{{issue.affectedServices.changeApprovers}}", but got an error "A selected user for this field no longer exists. Choose another user. (customfield_10003)". (customfield_10003 is Approvers).
Is there a way to adding add Approvers from "affected services" for a custom request type?