How to use multiple UART ports/lines simultaneously on Raspberry Pi CM4

Hello All,
I have bought two PMS7003 Plantower particle sensors which runs only on UART. I want test them simultaneously. I know there are 5 UART ports available on CM4, but I have no idea on how to enable them.
If anyone has done things like this or has any idea how to use multiple UART ports, Please help me on this.

Best regards