SQL 2016 has a new feature which converts data on SQL server to JSON. I am having difficulty in combining array of objects into array of values i.e.,

EXAMPLE -

CREATE TABLE #temp (item_id VARCHAR(256))

INSERT INTO #temp VALUES ('1234'),('5678'),('7890')

SELECT * FROM #temp

--convert to JSON

SELECT (SELECT item_id 
FROM #temp
FOR JSON PATH,root('ids')) 

RESULT -

{
    "ids": [{
        "item_id": "1234"
    },
    {
        "item_id": "5678"
    },
    {
        "item_id": "7890"
    }]
}

But I want the result as -

"ids": [
        "1234",
        "5678",
        "7890"
    ]

Can somebody please help me out?