During the simulation process, only local information of the object is recognized for annotation

### Describe the issue

Hello, Dear developers,, thank you again for your contribution.
I have a question I would like to ask while using BlendPro.
Can I only focus on the local information of the object and generate a mask for that local information during the process of creating a dataset for blenderproc simulation.
For example, the following model is a combination of a cube and a cone. In the simulation process, I only want to focus on the cone part and generate a mask with only the cone part.
May I ask if the current blenderproc supports this feature？

### Minimal code example

_No response_

### Files required to run the code

_No response_

### Expected behavior

Only focus on local information of the model during the simulation process.

### BlenderProc version

V2.7.1

No files, tests, or runnable example are provided. Start by reviewing BlenderProc's existing simulation annotation and mask-generation entry points, then determine whether selecting a local component such as the cone is supported; done means documenting the supported workflow or defining the missing feature clearly.

Written by the indexing model from the issue text.