You could do it, but what is the goal? I don't think it would do anything useful, at least in most cases.
The reason you use a hall sensor for current measurement is that you want galvanic isolation and common mode rejection or that you have a large current and you want to avoid dissipation in a sense resistor. A current transformer provides all of these benefits -- isolation and common mode rejection by being a transformer and impedance transformation by having a large turns ratio. The main disadvantage of current transformers is that they don't work at DC, while hall sensors do, but if you cascade them you loose that benefit.
If the current dissipation in the CT load resistor is too high, that's a sign that the turns ratio is too low.