I don’t think what you want to do is feasible. Because the block identifiers change, you cannot use dynamic in this case.
It can be pretty annoying to work with nested blocks in resource definitions, e.g. the AWS WAFv2 WebACL resource. It’s just not possible to generate those blocks dynamically. See one way of working around that limitation.
Another thing you can do is to define all the blocks in your code and set the enabled value based on the result of a lookup, e.g. contains(var.addons_enabled, "some_other_feature") ? true : false
The best though would be if the provider supported a resource type that allows you to create a single add-on attachment which you can reuse with for_each like aws_eks_addon