storybook/docs/snippets/web-components/my-component-with-env-variables.js.mdx

```js
// MyComponent.stories.js

export default {
  title: 'MyComponent',
  component: 'my-component',
};

export const ExampleStory = {
  args: {
    propertyA: process.env.STORYBOOK_DATA_KEY,
  },
};
```