EKS: how to access configmap/aws-auth outside of the stack where EKS was created?

[NinoSkopac]

export class StRoleMapping extends cdk.Stack {
    constructor(scope: Construct, id: string, props?: StackProps) {
        super(scope, id, props);

        const cluster = aws_eks.Cluster.fromClusterAttributes(scope, 'Cluster', {
            clusterName: aws_ssm.StringParameter.fromStringParameterName(
                scope, 'ClusterName', 'ClusterName'
            ).stringValue,
            clusterEndpoint: aws_ssm.StringParameter.fromStringParameterName(
                scope, 'ClusterEndpoint', 'ClusterEndpoint'
            ).stringValue,
            clusterCertificateAuthorityData: aws_ssm.StringParameter.fromStringParameterName(
                scope, 'ClusterCertificateAuthorityData', 'ClusterCertificateAuthorityData'
            ).stringValue,
            kubectlRoleArn: aws_ssm.StringParameter.fromStringParameterName(
                scope, 'KubectlRoleArn', 'KubectlRoleArn'
            ).stringValue,
        });
        const crawlerStRoleArn = aws_ssm.StringParameter.fromStringParameterName(
            this, 'StateMachineRoleArn', 'StateMachineRoleArn'
        ).stringValue;

        cluster.awsAuth.addRoleMapping(crawlerStRoleArn, { // <== problem
          username: 'foobar',
          groups: []
        })
    }
}

Gives me Property 'awsAuth' does not exist on type 'ICluster'

I can import the cluster - I can write manifests to it - but it doesn't have the AwsAuth construct.

If I instantiate AwsAuth again, I lose connection to EKS because presumably the config-map/aws-auth gets overwritten, since AwsAuth is a construct.

[NinoSkopac]

I've now created an issue as well, pitching a feature request.