The docs for css.preprocessorOptions[extension].additionalData is not practical at all

### Documentation is

- [x] Missing
- [ ] Outdated
- [x] Confusing
- [ ] Not sure?

### Explain in Detail

What is missing:

1. Can we use reslove alias in it ? how was path treated ?
2. some working example of  newer scss `@use`

### Your Suggestion for Changes

just add it..please

### Reproduction

_No response_

### Steps to reproduce

_No response_