Check if Service Linked Role Already Exists

[andreprawira]

We have a CDK project with several stacks, one of them is going to deploy OpenSearch and it needs "AWSServiceRoleForAmazonOpenSearchService" to exists before the actual resource being deployed.
We deploy this project to many fresh accounts and as a multi region deployment (active active in us-east-1 and ap-northeast-2). Below is our code

if region == "us-east-1":
            slr = iam.CfnServiceLinkedRole(
                self,
                f"{props.customer}-{region}-Service Linked Role",
                aws_service_name="es.amazonaws.com",
            )

domain = opensearchservice.Domain(...)

So far this code works, but in the future we might be deploying it in regions that are not us-east-1 or ap-northeast-2 and this will break our code, or if the stack deployment is ap-northeast-2 first then us-east-1, this will also break the logic because the role will only be deployed us-east-1 but the stack will deploy OS domain in ap-northeast-2.

The best logic is not to check based on the region, but based on role's existance

// pseudocode below
    if slr.alreadyExists
       continue
    else
       create slr role

However, i dont see this mentioned in AWS CDK docs or other posts, is it possible, or is there another alternative method that will work?