( In Control ) mod for 1.20

Can some give a perfect command to increase minecraft regular zombie spawn rate please i need it for zombie apocalypse modpack . Im not that good its too complicated for me please someone help me .

https://www.mcjty.eu/docs/mods/control-mods/control-mods-20

( this is the guide site for 1.20 but i cant understand it im not good at english cant understand it ) please help me