Automatically update brokerstring in MSK

A customer is looking to migrate their kafka workload to MSK. they have a question on how to mange the broker strings when a scaling event occurs in the cluster. for example: the producer has a config which has a property:
bootstrap.servers={comma separated string of 3 broker urls}

now a scaling event occurs and now you have another broker. Now the ugly way is to update the brokerstring url section manually.

the other option is to use a round robin DNS or an ALB and all the clients(producers/consumers) talk to the endpoint and behind the scenes it maintains the broker strings.

though i doubt if second option is doable since MSK is managed. or may be i am understanding it incorrectly?

Looking for some guidance on how this scenario is solved for other customers.