Using Automation to copy custom field data array to Jira field

[thorngje]

I have a custom Insight field ("Watch list") linked to a "Person" object field which can store multiple person objects by Name.  I created an Automation to copy that data to the Request Participants field, however, I get the error 'data was not an array (Watch List)'

My first attempt was:

{
   "fields": {
       "Watch list": {
            "value": "Name"
        }
     }
}

Which obviously was incorrect.  Looking at my test issue json I have:

"customfield_10070": [

            {

                "workspaceId": "cf859c60-1a9a-4e0e-849e-82453026d7eb",

                "id": "cf859c60-1a9a-4e0e-849e-82453026d7eb:184",

                "objectId": "184"

            },

            {

                "workspaceId": "cf859c60-1a9a-4e0e-849e-82453026d7eb",

                "id": "cf859c60-1a9a-4e0e-849e-82453026d7eb:186",

                "objectId": "186"

            },

            {

                "workspaceId": "cf859c60-1a9a-4e0e-849e-82453026d7eb",

                "id": "cf859c60-1a9a-4e0e-849e-82453026d7eb:187",

                "objectId": "187"

            }

I am looking for how I need to format that Edit Issue field for the request participants field for the object names to populate.

Any help on these would be appreciated.  Thanks!