Setting compiler flags to a file in the projct TemplateInfo.plist template file

Question

I created a project template file - TemplateInfo.plist, which is defined using ARC. There are several external files that I included in the template that are not supported by ARC. In a regular project, I manually set the compiler flags for these files in the build phases -> compile sources in -fno-objc-arc, but how can I do this inside the template? I did not find anything related. Any idea?

thanks