Get load balancer ARN
arn=$(aws elbv2 describe-load-balancers --names <value> --query 'LoadBalancers[].[LoadBalancerArn]' --output text)
Get listeners
aws elbv2 describe-listeners --load-balancer-arn "$arn" --query 'Listeners[].{ListenerArn:ListenerArn,Protocol:Protocol,Port:Port}'
[