How to set corner radius to progress reached area?

Hi,
I am using your library in my android application to show some progress bar. It is a wonderful library.
I am expecting a function,
How can I set a corner radius to progress reached area only? Is there any way I can do that? or can you suggest me a trick to do this?
Thanks

No file, test, or entry point is named. Start by locating the Android progress-bar rendering code and clarify whether the requested setting should affect only the reached area; done would be a documented, tested way to configure that corner radius.

Written by the indexing model from the issue text.