Reading the aggregate value for a mirror column

Suppose I have a mirror column which sums the amounts on a numbers column. That column is connected to multiple items. When I make a query like this:

query {
  items(ids: [ids]) {
    column_values {
      ... on MirrorValue {
        display_value
      }
    }
  }
}

I get a response like this:

"items": [
  {
    "column_values": [
      {
        "display_value": "101, 202"
      }
    ]
  }
]

I would expect that the “display_value” would match what is displayed on my board, and if I want the individual values, I could dig into “mirrored_items”. Is there a way to get the aggregated value from this column, without parsing this string and performing the calculation myself (and determining which calculation I need to perform)?