```js
// MyComponent.stories.js

import { useChannel } from '@storybook/preview-api';
import { HIGHLIGHT } from '@storybook/addon-highlight';
import MyComponent from './MyComponent.vue';

export default {
  component: MyComponent,
};

export const StyledHighlight = {
  decorators: [
    () => {
      const emit = useChannel({});
      emit(HIGHLIGHT, {
        elements: ['h2', 'a', '.storybook-button'],
        color: 'blue',
        style: 'double', // 'dotted' | 'dashed' | 'solid' | 'double'
      });
      return {
        template: '<story />',
      };
    },
  ],
};
```