That's a fascinating way to think about it, I think you're right.
I'm hardly well versed in Chuuni but I was also curious as to its meaning at heart.
I think it's about greater purpose/meaning, ascending beyond the bounds of everyday thought and society, power to resist shackles and to be able to carve one's emotions upon the world.
It differs from power fantasy in that the focus in about escaping society and having purpose, as opposed to masterfully puppeteering the real world.