在注解中添加逗号分隔的证书字符串。

alb.ingress.kubernetes.io/certificate-arn: arn:aws:acm:us-west-2:xxxxx:certificate/cert1,arn:aws:acm:us-west-2:xxxxx:certificate/cert2,arn:aws:acm:us-west-2:xxxxx:certificate/cert3

https://github.com/kubernetes-sigs/aws-load-balancer-controller/blob/main/docs/guide/ingress/annotations.md#certificate-arn
此外，您还可以通过AWS Web控制台分配证书：EC2 -〉load balancers -〉listeners -〉tls：443 -〉view/edit certificates and add there an additional cert from ACM