Reference an external function that exists on an always loaded level blueprint

I have a persistent level with three levels inside it.

Two levels are loaded through blueprints and one is always loaded.
The one that is always loaded I would like to handle all gameplay elements.

For example, on each blueprint loaded level I have a trigger. When the player passes the trigger it will run a display dialogue function in the always loaded level blueprint.

At the minute I can get it to work because if i call this function then it only references ‘self’ and not the gameplay level blueprint.

How can i go about doing this or maybe i have gotten the wrong idea entirely.