Is there a way to query sublevels without loading them?

I have some blueprint class called Zone_BP, one exists in every sublevel of my streamed game and contains gameplay-pertinent information about that particular sublevel. I’m trying to build a list of every Zone_BP in the game at runtime, but obviously GetAllActorsOfClass(Zone_BP) doesn’t work because none of the sublevels will be loaded when this runs. Is there any simple way I’m unaware of somehow either iterate through each sublevel and query it when the game starts?