How to set lhotse mixed noise parameters in yaml
if use_lhoste set False, 
yaml set noise:
```
model:
  train_ds:
    augmentor:
          time_stretch:
                .....
          gain:
               ......
          noise:
            manifest_path: background_noise.json
            .....
          white_noise:
            ......
```
How should I set it when use_lhotse set True?