Is it possible to change the page function based on number of stories, or arbitrary params?

[redders6600]

Currently in preview.js I have the following addParameters call which defines a custom page function for addon-docs.

addParameters({
  docs: {
    // This allows us to set a param containing markdown (`description`) that
    // we can use for the description, or will fallback to JSDoc comments.
    extractComponentDescription: (component, parameters) => {
      if (parameters.description) {
        return parameters.description;
      } else {
        return component.__docgenInfo.description;
      }
    },
    page: () => {
      return (
        <>
          <Title />
          <Subtitle />
          <Primary />
          <Description />
          <Props />
          <Stories includePrimary />
        </>
      );
    },
  },
});

Some of our docs pages don't have any components (so no props table to display), and others have only one story. In those cases we don't want to repeat the primary story underneath (when we have multiple stories we do).

What would be nice (but I'm not sure if possible!) is if we could do something like this.

{
    page: (stories, params) => {
      return (
        <>
          <Title />
          <Subtitle />
          <Primary />
          <Description />
          { params.showProps ? <Props /> : null }
          { stories.length > 1 ? <Stories includePrimary /> : null }
        </>
      );
    },
}

I realise that docs itself is a param, so there would be a weird circular reference there, but essentially what I'm trying to do is dynamically generate the page based on any info that might be available... so is there any info available that we could pass to the custom page function?