Working with generated header files on Xcode

I would like to generate some headers to be able to export some data as preprocessor defines (context: exporting a project such that it can be consumed by non cmake projects).

This is quite simple using file(GENERATE) and then add those file to a target using target_sources(FILE_SET).

As some of the contents depends on $<CONFIG>, I put the generate files in seperate folders. ex.
config-$<CONFIG>/include/header.hpp and also set the BASE_DIRS accordingly`

This all works fine except on Xcode where it expands $<CONFIG> to NOCONFIG.

I get that this is a limitation of Xcode, XCode config generator expression becomes NOCONFIG.

But how can I achieve the desired result? I was using file sets to make installing the targets easier.

I would assume if I just loop over all the configs and add each file as a source I would loose the ability to install the header files based on config. I do believe include directories with $<CONFIG> does work on xcode. It seems like I would have to implement my own custom version of file sets to get this to work.