CSF3: Can't reuse stories in DocsContainer

[frassinier]

Is your feature request related to a problem? Please describe
I've switched stories for using CSF 3.0
I'm struggling while reusing stories from an external file with the addon-docs

I have a first file describing stories using CSF3

export const Default = {
	href: '#',
	children: 'Link example',
};

And I would like to reuse them that way:

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

import Link from '../';
import * as Stories from '../Link.stories';

<Meta title="Components/Link" component={Link} />

<Canvas>
	<Story
		story={Stories.Default}
		args={{
			children: 'Help',
			href: 'https://help.talend.com',
			disabled: false,
			hideExternalIcon: false,
		}}
		argTypes={{
			href: {
				description: 'Link reference',
				control: {
					type: 'text',
				},
			},
		}}
	/>
</Canvas>

<ArgsTable story="usage" />

Describe the solution you'd like
Be able to don't have to maintain the template while using MDX

Describe alternatives you've considered
I can still define a template

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

import Link from '../';
import * as Stories from '../Link.stories';

<Meta title="Components/Link" component={Link} />

<Canvas>
	<Story
		name="usage"
		args={{
			children: 'Help',
			href: 'https://help.talend.com',
			disabled: false,
		}}
		argTypes={{
			href: {
				description: 'Link reference',
				control: {
					type: 'text',
				},
			},
		}}
	>
		{props => <Link {...props} />}
	</Story>
</Canvas>

<ArgsTable story="usage" />

Are you able to assist to bring the feature to reality?
yes, sure

Additional context
—

[shilman]

Shiver me timbers!! I just released https://github.com/storybookjs/storybook/releases/tag/v6.4.0-alpha.15 containing PR #15533 that references this issue. Upgrade today to the @next NPM tag to try it out!

npx sb upgrade --prerelease

Closing this issue. Please re-open if you think there's still more to do.