Yes, try press-and-hold anywhere on the launcher. Then you can drag and drop or uninstall apps. When you drag icons on top of each other, you create a folder.
You might want to check out patchmanager in general and coderus' launcher combined patch (there are many patches for the launcher, this just happens to be my favourite) for your use case for information on how/what to change. Both Patchmanager2 and this Patch are available on openrepos/warehouse. When you look at the patch on github, you can see it changes stuff in /usr/share/lipstick-jolla-home-qt5/launcher/Launcher.qml (among other places)