How to access folder level

Experience Manager (PaaS/OnPrem)
1

Here is Use case i am looking

  1. http://localhost:8080/site/rest/header (Parent folder which may have some JSON)
  2. http://localhost:8080/site/rest/header/left(left Side JSON under folder header/left.)
  3. http://localhost:8080/site/rest/header/right(right Side info JSON under header/right)