you should look at the Minion options.
Also, the simple build is just a suggestion for you to use. Different play styles of the players will cause that to be different. The more you use it, the more you’ll be able to tweak it for your players to fit.
I’ve never been one to use “CR” calculations even in DnD, I usually make a creature that makes sense for the area and encounter and use them like that. I follow this the most when creating a simple NPC: Cheat sheets/DM screens?
And of course, for a complex, I usually make it a level that feels right compared to the players with potential minions or other NPC to balance out the action economy.