Creating a forest then wrapping it into a Blueprint

Ok so I tried the Level Stream idea, the loading time is great!

However, I struggle to reach variables and/or actors.
Is there a node I’m missing in between?

I first stream the levels and added them to an array, similar to how I’d act with a Blueprint:
image

Within the sub-level Main Blueprint, I created an array:

Then I try to get that array but I can’t :

Is there an in-between node? or it’s just not possible

Thanks a lot