storybook/docs/snippets/web-components/parameters-in-meta.ts.mdx

```ts
// Button.stories.ts

import type { Meta } from '@storybook/web-components';

const meta: Meta = {
  component: 'demo-button',
  //👇 Creates specific parameters for the story
  parameters: {
    backgrounds: {
      values: [
        { name: 'red', value: '#f00' },
        { name: 'green', value: '#0f0' },
        { name: 'blue', value: '#00f' },
      ],
    },
  },
};

export default meta;
```