[REQUEST] return Object instead of map of a arguments in batchFn

## What problem are you trying to solve?

Use object in batchFn return instead of function.

## Describe the solution you'd like

The user should be able to return an object which contains the key as a cacheKey and its return value as a return. This can improve perf for very large requests/args. instead of mapping the the args with the result, the user can now create an object from the result.

## Describe alternatives you've considered

## Additional context

Mapping the args for a very few results from the backend is time-consuming.