Okay MarkT thank you. I didn't pcb design with CGND but I found 1 design. On this design he/she used CGND but he/she connected CGND to AGND polygon on PCB design side.
I will use AGND polygon for CGND little square left bottom side ( Rest will be GND polygon.) That is how I do it probably. As I said PR2040 don't have AGND will it be a problem?