It is not entirely clear but most people would tend to say that you would need to have a subscription.
I have seen other people use alternative solutions, such as fluentbit together with OpenSearch. I have not yet done this myself.
In OperatorHub I have seen the community based Logging Operator from Opstree which apparently can also be used to deploy the traditional components Elasticsearch, Fluentd and Kibana, much like Red Hat's Loging Operator.
I have also not used this myself yet. But I am also currently collecting information about such alternative solutions for a community products based logging stack.