Hi MARS
Yes. For voltage channel, 1000:1 attenuation, using resistor divider, is common. So, it is fine. Please make sure that, even when the line voltage is at its absolute maximum value, it doesn't cause the input to the chip to exceed +500mVpeak.
For burden resistor value calculation, kindly refer to a Q&A in page 4 of the AN-639 document.
Regards
hmani