Use the `chevron` attribute to add a chevron to the navigation item.
**Hints:**

- Only works with `vertical` attribute.
- `Button` and `Link` variants show right facing chevron dependent on property.
- `Accordion` variant always show up / down chevron to reflect open state.

```html
<sd-navigation-item vertical chevron>Vertical navigation with chevron</sd-navigation-item>
```