vite + vuejs annotation prop

Hi,

I'm experiencing some issues with mdx-annotation in a Vite + Vue.js project.

Sandbox : https://stackblitz.com/edit/vitejs-vite-syte2b

```html
<h1 annotation="{ id: 'foo' }">Foo</h1>
```

Expected result:

```html
<h1 id="foo">Foo</h1>
```

Am I missing something?

Thanks !