Niagara: Start Module if Boolean is true


I have a Niagara System which is running in the level constantly.
One of its Modules reacts to other static meshes in the level. I’d like to send a boolean from these actors to the Niagara System which should start the module… Sending the boolean value via BP to the Niagara System is not my problem.

My issue is:

How do I start a module with a boolean dependency. I just don’t understand booleans if in Niagara.

thanks in advance for any advise