Will this feature be possible in the future?

You mean, will it be possible to use those value as parameters? Unlikely. The number of buildings is a technical piece of information - nobody says "it's a town of 500 houses". Population is a pretty arbitrary value - if you need a town with 5000 inhabitants, just take any town and state its population is 5000.

You could technically enter a custom size until it generates something with an estimated population close enough to what your aim is to just say some buildings are more or less densely populated than they look.