backstage.io supports the extension of the model (https://backstage.io/docs/features/software-catalog/extending-the-model/) - doing this is very applicable to several of our use cases - does harness support model extensions? If not we request that it can be done. As an example we need to extend the model to add support for what we internally call canonical APIs which have properties that need to be required that are beyond what the normal API model supports.