[boost::locale or boost::nowide] C++23 char8_t. How to convert std::u8string <-> std::string?

Hi,

as c++23 is now way out of the door and c++26 is already on the
horizon, is there any thing in the boost libraries cor the "new" u8
literal and the new u8strings?

I can only find mentioning char8_t in context of boost::filesystem. 
https://www.boost.org/doc/libs/latest/libs/nowide/doc/html/index.html#using

	For std::filesystem::path available since C++17 there is no way
	to imbue a locale. However the u8string() member function can
	be used to obtain an UTF-8 encoded string from a path. And to
	obtain a path from an UTF-8 encoded string you may use
	std::filesystem::u8path or since C++20 one of the path
	constructors taking a char8_t-type input.

But it seems there is nothing like narrow() or widen() to convert from
std::u8string <-> std::string (needed for non char8_t aware libraries).
Think Win32 API. 

Is the only recommendation: Just stay on std::string and ignore char8_t?
Still in 2025? Even with boost libraries?

Bye
  Georg
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