Luckily we support Autodesk Eagle natively, so the steps are very very simple ;-)
We offer an EAGLE Design Rule File which includes our layer stackup and all necessary design rules. Have a look at our Github.
Please set layer definition to (1+2*15+16), otherweise we won't recognize all 4 layers of your design.
Our import is not yet compatible with EAGLE files exported from Fusion360. Please use Gerber Import instead.
We supplort Eagle file format natively. Just Drag'n'Drop or Upload your Eagle-Board file and you are good to go.