Setting focus point

I’m using autofocus through the CG4 API and wondering if there’s a way to set a point to focus on (similar to how you can touch the screen in liveview or can pick an AF Point by clicking the “AF Point Selection” button (top right on the SL3s I’m using).

See page 108 of https://gdlp01.c-wss.com/gds/2/0300034502/02/eosrebelsl3-eos200d2-ug-en.pdf for an example of what I’d like to do programmatically through CG4.

Thanks!