How to fetch AttributeSpecifierList when migrating from v3 to v4?

In v3, the Declarator type has a member AttributeSpecifierList, but that doesn't exist anymore in v4. It seems to have moved to Declaration, but we can't use Declaration to extend Node type and fetch the attributes from it. Any ideas/suggestion how we can fetch the Attributes list when using Declarator to cast Node type?

Reference code: https://github.com/Nikhil-Ladha/go-ceph/blob/update-modernc-pkg/contrib/implements/internal/implements/cast.go#L65