```js
// MyComponent.stories.js

import MyComponent from './MyComponent';

export default {
  component: MyComponent,
  title: 'A story using environment variables inside a .env file'
};

const Template = (args, { argTypes }) => ({
  components: { MyComponent },
  props: Object.keys(argTypes),
  template: '<MyComponent v-bind="$props"/>'
});

export const Default = Template.bind({});
Default.args = {
  propertyA: process.env.STORYBOOK_DATA_KEY
};
```