To handle the value of carList outside of the UI without making additional backend calls, you should consider using a mechanism that can store and update the value as it changes. Here's a summary of the solutions:

Use a Stream if you expect continuous updates (ideal for data that changes over time). This allows you to listen to updates without repeatedly calling the backend.

Use a ValueNotifier or cache the value if you want to store the latest value and access it without waiting for a Future to complete each time.

State Management Libraries like Provider or Riverpod are ideal for managing complex or shared state in larger apps.

These solutions allow you to access the latest carList value without triggering extra backend calls, while ensuring your application logic remains clean and efficient.