if err != nil {
		return nil, err
	}
	spec, ok := u.Object["spec"].(map[string]any)
	if !ok {
		return nil, errors.New(`field "spec" is not a map`)
	}
	var mem hubMembership
	mem.WorkloadIdentityPool, ok = spec["workload_identity_pool"].(string)
	if !ok {
		return nil, errors.New(`field "spec.workload_identity_pool" is not a string`)
	}
	return &mem, nil
}