Having trouble getting vercel to apply the settings in the vercel.json to the api route.

This is a NextJS App router project. The full project path for that file is

<projectRoot>/src/app/api/sync/pull/route.ts


When I configure my vercel.json like this, vercel builds fine, but when I inspect the functions for the deployment, it's just the normal 1G memory and 15s timeout. We have a Pro plan so these should be valid values. I tried removing app from the path and then vercel fails to build. Any thoughts?

And this may be more a vercel issues than Next. if I need to ask this elsewhere just let me know.

{  
  "functions": {
    "app/api/sync/pull/route.ts": {
      "memory": 3009,
      "maxDuration": 120
    }
  },