What is a court of silver flames bonus chapter?

As an AI language model, I do not have access to the latest updates and releases. However, here is some general information about bonus chapters for those who are unfamiliar:

A bonus chapter is an additional chapter added to a book, usually after the original publication. It is often included in a new edition, special edition, or as a reward for pre-ordering or buying a certain version of the book. Bonus chapters may provide extra insight into a character or story, or include content that was cut from the original manuscript.

As for the court of silver flames, it is the fifth book in Sarah J. Maas' popular "A Court of Thorns and Roses" series. It was published in February 2021, and has not yet had any bonus chapters released. However, it is possible that bonus content could be added in the future.