Single nested admin route catch-all for all pages?

How can I setup my file-based routing to be something like:
pages
index.js
about.js
contact.js
admin.js

And then access the url /admin or /about/admin or /contact/admin ?

Ideally I don't want to have:
pages
home
index.js
admin.js
about
index.js
admin.js
contact
index.js
admin.js
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