At first, I thought it wasn't about the extended editor; I thought it was just about the properties. But yes, you can do it through the editor, but I entered it manually and put everything in a .pak file.
Added 2 minutes later
In principle, I can put all the files from my .pak into data.pak, but I want people to be able to download the mod and play it without replacing the game's files (which will happen if I put everything in the main archive).