Bind Scriptable Object to Timeline and let it receive signals from markers

Hi.
Im trying to bind a scriptable object to my custom marker track, but when I do, i can’t add any markers on the track. It seems like its supposed to be for monobehaviour signal receivers only.
Im basicly trying to signal the Game Manager to load a scene and then transition to it, but I would like all of that to happen without adding an extra “Gamemanager signal receiver” component to the playable director object. It seems like someone has already tried to do the same thing ( Sending signals to objects not in scene (global signals?)) , but I have no idea how the managed to implement it.
Any ideas?
I have added INotificationReceiver to my GameManager script but so far it does nothing.