How do I add extra include directories to my port in .vcxproj?

[Jeshibu]

I've got an overlay port (MYLIBRARY) with many header files that reference files from the include/MYLIBRARY folder like this: #include <Sibling.h>, or like #include "Root.h" (where Root.h is located at include/MYLIBRARY/Root.h, and the referencing file is in a subfolder).
There are too many header files to solve this with .patch files.

Using CMake, I can solve this easily by calling target_include_directories() for every target I provide in the port's share/MYLIBRARY/MYLIBRARY-config.cmake file. However, using .vcxproj files to build consuming projects through Visual Studio 2022/MSBuild, I cannot find a way to add this folder to the include folders. There don't seem to be any vcpkg macros available to use in an <IncludePath> property that point to vcpkg_installed\x64-windows (I could hardcode that but I need to build for other triplets too).
I've also tried adding the overlay port files directory's include folder to the <IncludePath> property, but that leads to double definition errors.