Creating a Page with text + list of posts by tag

Themes
2

I’ve tried a mix of route / collection:

collections:
  /:
    permalink: /{slug}/
    template: index

  /id/:
    permalink: /id/{slug}/
    template: page-identity
    filter: primary_tag:identity
    data: page.identity

with a page-identity.hbs but no luck… I can’t load the post of the page identity before the #tag…

it shows me the posts list but not the page content :frowning:

Help! :'(