concatenate multiline or stack trace log messages on EKS

Is there a way to concatenate multiline or stack trace log messages on EKS when shipping them to cloudwatch?

Fluen-bit provides the option of 'filters' that can be configured. To concatenate logs there is a 'multiline' filter: https://docs.fluentbit.io/manual/pipeline/filters/multiline-stacktrace

During our spikes we saw that the daemonsets in EKS fargate are not supported so the option of using fluent-bit is not possible.

Found that AWS provides a dedicated ConfigMap based on fluent-bit, but it doesn't have all the features of the original fluent-bit, and the multiline filter is not available. https://docs.aws.amazon.com/eks/latest/userguide/fargate-logging.html

We would like to know if it is possible or not. Thanks.