datahub/datahub-web-react/src/graphql/connection.graphql

mutation upsertConnection($input: UpsertDataHubConnectionInput!) {
    upsertConnection(input: $input) {
        urn
        details {
            type
            json {
                blob
            }
        }
        platform {
            ...platformFields
        }
    }
}

query connection($urn: String!) {
    connection(urn: $urn) {
        urn
        details {
            type
            json {
                blob
            }
        }
        platform {
            ...platformFields
        }
    }
}