How to get the a ICNS file for game icon on mac

In Project settings i can get the windows .ico file to work for the windows icons just fine, just had to include 512 256 128 64 and 32px sizes… I figured doing the .icns would be similar but no matter what i’ve tried i can’t get any icns file to work unreal says “Unsupported file format”

So my question here is how do i make an .icns file that unreal will recognize

Does it even really matter now that i think about it? Steam lets you set the icon for the game anyway, assuming epics process is probabbly similar