I have my 12V AC dimmable LED landscape lights connected to a Z-Wave dimmer. Here’s what I would do…
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Rip out your current transformer and replace it with a quality hardwire magnetic transformer unit that supports dimming such as (https://www.totaltransformers.com/review/product/list/id/7584/) or the equivalent based on your capacity (wattage) needs.
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On the 120V AC side feed the transformer with a magnetic low voltage capable Z-Wave dimmer such as (https://byjasco.com/products/ge-z-wave-plus-wall-smart-dimmer). Make sure the dimmer supports LED and magnetic loads. You will need to connect a neutral.
In a way it is not much different than MLV interior lights that support dimming.
End result will look something like this:
