KiCAD doesn’t offer an import function for predefined Design Rule files. You should set these up yourself in the KiCAD-interface.
We recommend to set the units in PCB editor – Preferences – General – to millimeters.
Open Design Rule Editor. Here you find two sections. In global Design Rules you will find the Values for minimum Track width, minimum Via Diameter and minimum Via drill diameter. In Net Classes Editor, you will find the Values for minimum Clearance.