Use `gts` components for examples

Is there a way to use `gts` components for the examples? I've tried doing this, but I get runtime errors.

My example component (`menu-default.gts`) for the docs:

```handlebars
// BEGIN-SNIPPET docs-menu-default.gts
import Component from '@glimmer/component';
import UiMenu from '@onwardcare/ui-components/components/ui-menu';
import UiPortalTargets from '@onwardcare/ui-components/components/ui-portal-targets';
import DocsDemo from 'ember-cli-addon-docs/components/docs-demo';

interface Signature {
Element: null;
}

export default class MenuDefault extends Component {

Open Menu

Item 1
Item 2

}
// END-SNIPPET
```

The runtime error I receive: