Binary file access from code after the project has been packaged

Currently I access my custom binary files in the project using the IFileManager::Get().CreateFileReader(*(FPaths::GameDir() + FileName)); function. After packaging the project (with File->Package project) all the assets and other content files are assembled into a single .pak file, so the above function no longer works. How do I go about accessing my data inside this pak file?

On PC I just copy my files to directory of packaged game where they are in project folder.

However there are options in Packaging: Additional non-asset directories to Package/Copy

Although I don’t confirm that it works. Just found this options.