Plumb a non-plumb espresso machine?

I have a Lelit Mara X2 and it's great but it is not a plumbed-in model.

Does anyone know of any projects to convert a non-plumb model to have an automatic water source? Once a water line is run to the machine, I'm thinking something like:

• Small automatic water fill valve in the water reservoir
• Arduino project with water level detectors in the reservoir controlling a valve
• or just keep it simple and put in a manual valve

Has anyone done, seen or heard of a similar project?