Enable preview using a query string passed?

[notflip]

I'm trying to get the "Open Preview" button functionality working, see: https://www.sanity.io/docs/migrating-production-url-resolver

most of the example code looks something like this:

productionUrl: async (prev, context) => {
  const { getClient, dataset, document } = context;
  
  const client = getClient({ apiVersion: '2022-06-07' }); // Ensure to specify the correct API version
  const slug = await client.fetch(`*[_id == $id][0].slug.current`, { id: document._id });

  // Define your base production URL
  const baseUrl = 'https://your-production-site.com';

  // Build the URL based on the document type
  let url;
  switch (document._type) {
    case 'page':
      url = `${baseUrl}/${slug}/`;
      break;
    case 'post':
      url = `${baseUrl}/posts/${slug}`;
      break;
    default:
      url = baseUrl;
  }

  // Optionally add any query parameters
  return `${url}?preview=true`; // <------------- see this line in particular
}

This uses a query string to enable the preview mode, instead of first browsing to /preview/enable.
Is this possible at the moment? To enable the preview mode by passing a query string?

EDIT 1:
I tried the following: created a sanity.client.js file in the plugins, but the previews mode is not enabled so it seems

export default defineNuxtPlugin((nuxtApp) => {
  const { query } = useRoute()

  if (query.preview) {
    useSanityLiveMode()
  }
})

EDIT 2:

I saw in the code that there's a redirectTo variable, so that we can use the default /preview/enable.

return `${process.env.SANITY_STUDIO_PREVIEW_URL}/preview/enable?redirectTo=${slug}`

The only issue now, is that we need to find a way to add the secret to this link, the token is stored in the web .env, should it be stored in the studio .env as well, and passed here?
Thanks!