often times one must import existing resources into a stack when working with aws-cdk. When we "destroy" the stack we take it for granted that the existing resources we imported are not deleted along with everything else.
Is it possible to explicitly not destroy a resource during the destroy process?
Imported resources won't actually be a part of your new stack (i.e. they won't be resources in the generated CloudFormation). So if you are only concerned with those resources you don't need to worry.
If you are wanting to make sure something in the stack is not being deleted when the stack is deleted you can call the applyRemovalPolicy(RemovalPolicy.RETAIN) on the resource.