It does not make much sense to say Nomad is in millimeters.
A 3d software works in terms of “unit”. Whether it’s centimeters, millimeters or meters is only relevant when you send it to the 3d printer.
And usually you can change this setting in printer softwares.
For example https://www.sculpteo.com/en/3d-learning-hub/design-guidelines/3d-printing-dimensions/
On Sculpteo the default measure unit set is the millimeters, but you can choose, before you upload your file, between Millimeters, Centimeters and Inches as unit of measure for your 3D print.
It simply means your 3d printer software works with 1 unit = 1mm.