How to enable ClangRefactoring and ClangPchManager plugin ?

[TBRZ]

How to enable the following plugins ?

Plugin ClangPchManager, with CONDITION TARGET libclang
Plugin ClangRefactoring, with CONDITION TARGET libclang

The following are enabled, with the same condition:

 * Plugin ClangFormat, with CONDITION TARGET libclang
 * Plugin ClangCodeModel, with CONDITION TARGET libclang

I'm building it on macOS, QtCreator is at the latest master: 6efb09a86ac5581f2453aa070804d896692e065b. LLVM - clang 11.
I buillt clang with the following options

-DCMAKE_BUILD_TYPE=Release \
-DLLVM_ENABLE_PROJECTS=“clang;clang-tools-extra” -DCMAKE_CXX_STANDARD=17 \
-DLLVM_INCLUDE_TESTS=OFF \
-DLLVM_CCACHE_BUILD=ON  \
-DLLVM_ENABLE_RTTI=ON