Add user who transitioned issue to a multi user picker custom field

[Deleted user]

We have a multi picker user field called Stakeholders.  After an individual transitions a ticket through the workflow, we would like them added to the stakeholder list.  We use Jira Cloud.  I have tried multiple ways with using the assignee or the initiator to custom field.  I tried with both post functions and automation and have been unable to be successful.  My last attempt was the following in Jira automation:

When issue transitioned:

Edit Issue fields

Stakeholders

{
"fields": {
"Stakeholders": [{
"add": "{{assignee.accountId.asJsonObjectArray("id")}}"
}]
}
}

This says it is successful but the field is still empty.   Any help?

[Bill Sheboy]

Hi @[deleted] 

The function asJsonObjectArray() is not finding the "id" key as you have already dereferenced to accountId, and so it returns null.

Please try with {{initiator}} and instead of going to the accountId attribute first, convert to JSON and then replace the key.  Something like this:

{{initiator.asJsonObjectArray("accountId").replace("accountId", "id")}}

Kind regards,
Bill