Open Level Options commands?

Hi there.
I haven’t found much about what you’re supposed to be able to do with this. The documentation barely has anything about it.
Can I set a variable in a class in the next map with a command in this Options section?

I remember that in UDK you could do something like ?Game=GameInfo.MyVariable=123456
and this worked, but I can’t seem to get it to work in UE4.

Could anyone please explain me how to use this properly? Thank you.