Environment Query System & Behavior Tree - Run Mode

Hello,

I am new to Environment Query system.
Partially followed the quick start guide.
I am able to use "Run Mode - Single Item * "

I am having trouble understanding how do I use “Run Mode - All Matching” in the behavior tree and how to store its results and use them elsewhere.
The tool-tip/documentation suggests “This retrieves all the locations (or actors) that match the query.”

Say, my query returns a set of locations(or actors), how do I store them all in the blackboard?
Is there an example of this?
Thank you in advance.

PS: I am able to use the EQSTestPawn to test all locations, but that’s irrelevant to my question above.