Isn't the power production inside the sun on the order of 300 W/m3? Is it at all reasonable to think we could scale this process to 0.1-100 MW/m3, to become eco

Isn't the power production inside the sun on the order of 300 W/m3? Is it at all reasonable to think we could scale this process to 0.1-100 MW/m3, to become economically viable?