The DirectX 12 Agility SDK package provides CMake targets:

    find_package(directx-headers CONFIG REQUIRED)
    find_package(directx12-agility CONFIG REQUIRED)
    target_link_libraries(main PRIVATE Microsoft::DirectX-Headers Microsoft::DirectX-Guids Microsoft::DirectX12-Agility)

    if(TARGET Microsoft::DirectX12-Agility)
        file(MAKE_DIRECTORY "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/D3D12")
        add_custom_command(TARGET main POST_BUILD
            COMMAND ${CMAKE_COMMAND} -E copy $<TARGET_PROPERTY:Microsoft::DirectX12-Core,IMPORTED_LOCATION_RELEASE> $<TARGET_FILE_DIR:main>/D3D12
            COMMAND ${CMAKE_COMMAND} -E copy $<TARGET_PROPERTY:Microsoft::DirectX12-Layers,IMPORTED_LOCATION_DEBUG> $<TARGET_FILE_DIR:main>/D3D12
           COMMAND_EXPAND_LISTS
        )
    endif()