style-src directive doesn't exist

I expected this library to generate the hashes for the script-src and style-src directives, as well as the script-src and style-src directives themselves, but the style-src directive does not exist in the generated CSP and is not even mentioned anywhere in the libraries' code. Are there plans to address this issue? Would it include sourced styles hashes in the same way as it already does for the sourced scripts? When?