Mapping between markdown files

[artt]

I'm creating a multi-author site and have the following file structure:

/posts
- /post-1/index.mdx
- /post-2/index.mdx
- ...
/members
- /member-a/index.mdx
- /member-b/index.mdx
- ...

In the frontmatter of the post page I have an array of authors like

authors: [Member A, Member B]

and I have the name of the author in the frontmatter of the author's markdown file.

I'd like to set the schema up so that when I query the post, I also get the details of the authors as well (name, email, etc.).

From reading this page it seems like I need to create a custom resolver... but all the examples I see have all the authors in one json file (so you have two collections, MarkdownRemark and AuthorJson... while I think for my case all my posts and members are in MarkdownRemark collection.

Thanks so much!