Outdoor Low Voltage Lighting Recommendations

I’m having low voltage lights for the exterior of my house put in. I was wondering what my options are here with regards to having it connected to home assistant. It seems like there are some (pricey) smart transformers and smart lights out there. It also seems like it might be possible to achieve my goal with some sort of Sonoff or Shelly device. Any insights into doing this would be appreciated.

Just put a smart plug on the transformer.

It really depends on your physical setup.
A smart plug, like the one stevemann suggest is one solution, but there are also devices to insert into the wiring, like the Shelly, which might be the ones you refer too, and there are also smart switches for directly mounting on DIN rails in your electric cabinet, if the wires are pulled all the way there.