Referencing an array key including a parenthesis in a test

How can I reference this array key directly in a test? sum(quantity)

Test:
console.log(responseJson.groups[0].totals)

I need to drill down 1 more into sum(quantity)

Json Response (partial)
“groups”: [
{
“by”: {},
“totals”: {
“sum(quantity)”: 411696
},

Special characters, so instead of using dot notation, you can do the following.

let groups = 
[{
    "by": {},
    "totals": {
        "sum(quantity)": 411696
    },
}]

console.log(groups[0].totals["sum(quantity)"])

Groups is an array of objects, and totals is also an object. (An array is a special type of object).

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