how to enter nested data on apollo-boost gql:

export const UPDATE_CAMPAIGN = gql`
    mutation updateCampaign(
        $campaignName: String
        $startDate: String
        $duration: Int
        $approvedDate: String
        $CAMPAIGNSTATUS: CAMPAIGNSTATUS
        $ARTWORKSTATUS: ARTWORKSTATUS
        $contentStatusDeclineCause: String #for our reference
        $artworkComment: String
        $artworkSVGFiles:{
            $create:[
                {
                    $bucket: String!
                    $region: String!
                    $key: String!
                },
                {
                    $bucket: String!
                    $region: String!
                    $key: String!
                }
            ]
        }

$artworkSVGFiles is not working!!! 😭 Any suggestions pls? Thanks