Print Studio can't do it, but MeshMixer can -- here's a video I found:
There's also the Spark Lattice Infill Tool, which was abandoned but still can be made to work:
From that tool, you can export an object and import it into Print Studio multiple times.
Autodesk Netfabb also has a lattice infill tool. It's a premium feature, but there's a 30 day trial, which may be of some use to you.
Best of luck!