My Jazz is 2018 SE CVT mk.3
I looked into putting a towbar on it (later got a Yaris for work and towing so didn't put one on the Jazz).
Have a search on the various towbar supplier sites for different makes (Witter, Brink, Westfalia etc, i went with Witter detachable) and check the fitting instructions, usually available as pdf downloads. You need to do a little cutting of the end of the chassis members to install the fixings and IIRC also a small cutout in the middle of the plastic "bumper ", depending on exact make/model of towbar (removable or fixed etc).
Unbraked trailer weight limit is 450kg, nose weight on the towbar recommended to be around 10% of trailer weight.