Check if blueprint exists in content folder

How to check if a blueprint with a class exists, not in the level, but in the content folder as in it has been created. Basically I want to allow seamless integration of a plugin in my content pack, but only if the given plugin is installed and the accompanying blueprints exist, do i want to execute a function. How do i check if a certain class of a blueprint is available? not in the level, but in the content folder!