How to manually set an actor component to an array of actors in the world?

In the world, we should be able to directly specify object variables that are instance-editable, but it seems that we can’t do that with actor components. Even though it is a component owned by the actor itself, it cannot be put into a variable.

In particular, the order of the array is important in the case I’m trying to do, so not being able to set it manually is very frustrating. Why can’t we do something so simple?