```md
<!-- Page.stories.mdx -->

import { Meta, Story } from '@storybook/addon-docs';

import { Page } from './page.component';

<Meta title="Page" component={Page} />

export const Template = (args) => ({ 
  props: args,
  template:`
    <storybook-page>
      <ng-container footer>${args.footer}</ng-container>
    </storybook-page>
  `,
});

<Story
  name="CustomFooter"
  args={{
    footer: 'Built with Storybook',
  }}>
  {Template.bind({})}
</Story>
```