Zigbee dimmer transformer

Hi all, I’ve got a dresser that has 4 x gu4 20w halogen bulbs and I think the transformer is on its way out as it started to make the lights flicker. Anyway, thought I’d take the opportunity to make them smart; currently on a plug to turn them on and off, but was thinking about a zigbee dimmer of some sorts. Has anyone got any suggestions as to a zigbee transformer I’d need, have enlosed a pic of the current transformer which has a dimmer knob attached before getting to this, was hoping to just bypass that and do the dimming from the ST app.

Thanks all.