Improve error messages in routes

**Description**
Currently helpers lacks proper import support.

**Proposed solution**
Add configurable import with sensible defaults.

**Priority**: Low/Medium

Start by locating the routes and helpers entry points and read how helper imports and route-related errors are currently handled. Confirm the intended configurable import behavior and sensible defaults with the issue discussion; done means the behavior is implemented and the resulting error messages clearly report import problems.

Written by the indexing model from the issue text.