[import/no-unused-modules] Typescript `namespace` usage results in false positive

// Foo.ts
export namespace MyNamespace {
  export interface Internal {
    a: string;
  }
}

// Bar.ts
import { MyNamespace } from 'Foo';

export const internal: MyNamespace.Internal = { a: 'a' };

/src/Foo.ts
  2:3  error  exported declaration 'Internal' not used within other modules      import/no-unused-modules

Both the export of MyNamepsace and Internal seem to be required for the usage to compile in Bar.ts. I think this kind of usage should not result in any errors. The namespace in Foo.ts can be replaced with the module keyword and the same false positive is raised.

This seems to be in a similar area to https://github.com/import-js/eslint-plugin-import/issues/1964 but with a different rule.