An Ontological Argument For Free Will

I've long suspected, and I am not smart enough to flesh this out, that there is some argument to the end that the very ability to conceive of free will is proof that we have it. If I can imagine chaos, I have introduced it into my system. If I've conceived of openness, then I have introduced it into the system of my mind. If freedom doesn't exist, it is not only nonexistent but impossible. St. Anselm thought that the very ability to conceptualize God led one to a proof of his existence. I'm not sure that Anselm was right about this. But my thinking about freedom runs along similar lines.