```ts
// Page.stories.ts

import { Meta, Story } from '@storybook/angular/types-6-0';
import Page from './page.component';

export default {
  component: Page,
  title: 'Page',
} as Meta;

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

export const CustomFooter = Template.bind({});
CustomFooter.args = {
  footer: 'Built with Storybook',
};

```