storybook/docs/_snippets/storybook-coverage-addon-registration.md

export default {
  stories: [],
  addons: [
    // Other Storybook addons
    '@storybook/addon-coverage', //👈 Registers the addon
  ],
};

// Replace your-framework with the framework and builder you are using (e.g., react-webpack5, vue3-webpack5)
import type { StorybookConfig } from '@storybook/your-framework';

const config: StorybookConfig = {
  stories: [],
  addons: [
    // Other Storybook addons
    '@storybook/addon-coverage', //👈 Registers the addon
  ],
};

export default config;