Support snake_case for labels derived from properties

### Is your feature request related to a problem? Please describe.

There two popular naming convection exists: CamelCase and snake_case.

For CamelCase you have:

But in my case property names come from database column names, where snake_case is used.

### Describe the solution you'd like

Please apply your rule also for snake_case. I expect `Snake Case`.

### Describe alternatives you've considered

Or, probably, allow to configure a callback, which could be used to generate labels.

### Framework

_No response_

### RendererSet

_No response_

### Additional context

_No response_