Allow the story property to accept String or Function as values

[himedlooff]

Is your feature request related to a problem? Please describe
I have complex documentation per story that I'd like to render into the docs page but it is currently not possible.
For example I'd like to render some custom HTML into the description of a story.

Describe the solution you'd like
As described here: #8527 (comment)

Functions can be passed as values to parameters.docs.page:

export default {
    ...
    parameters: {
        docs: {
            page: () => (
                <>
                    <Title>My Story</Title>
                    <Description markdown={docs}/>
                    Whatever else..
                </>
            ),
        },
    },
}

But not for a specific story's description parameters.docs.description:

MyStory.parameters = {
    docs: {
        description: {
            // "story" property should also accepts a function, just like "page" for default export
            story: () => (
                <>
                    lots of complex things goes here
                </>
            ),
        },
    },
}

It would be great for story property to accept String or Function as values, for more control over story-specific descriptions

Describe alternatives you've considered
There are none that I know of.

Are you able to assist to bring the feature to reality?
Maybe with some guidance?

[jesrodri]

Hi, can I try this one?