Camera Look at Actor inside Blueprint


I am new to UE4 and looking for a pointer regarding the cine camera’s ‘look at tracking’ settings.

I have an object moving along a spline over a number of seconds. In the attached blueprint the moving object is a simple cube component. I want the camera to look at the cube as it moves along the spline. But because the cube is inside a blueprint I cannot select it from the ‘Actor to track’ menu.

if anyone has any thoughts on how I might go about making the camera look at the object, it would be much appreciated. Or if anyone knows a tutorial out there that deals with tracking meshes inside blueprints?