I downvoted you for the following reasons: You failed to point to the documentation on the given Blueprint node. Secondly in the provided C++ code you chose *FPaths::GameContentDir() as the appropriate function when, AFAIK, that points to the Game/Content folder and not a given plugin/Content folder. The OP spoke directly about level maps in a plugin and not the standard content folder. If the FindFilesRecursive function handles this, no worries, but I’m dubious.
Make the following corrections to your answer and I’ll retract my downvote:
Link to the documentation of the “Get Streaming Level” node.
A image of the node being used for the purposed you suggest.
Adjusting the C++ example (if needed) to search through a give plugin’s content folder.