I'm using ChaiScript for a simple game engine project that I'm working on at the moment. I have a basic scripting system implemented so far, where each entity can have a script attached to it, and each entity gets a separate ChaiScript object. I would like to add a feature so that a script can call a function that is inside another script, example:
In one script I could have:

def someFunction() {
    return 1 + 2;
}

And then in another script I want to be able to do the following (I already have FindEntity set up and working):

// Call someFunction, that is defined in the script attached to "Some Entity"
FindEntity("Some Entity").GetScript().someFunction();

How would this be done, if it is possible?