We do have our documentation that covers this a little bit. It can be a little sparse with the details of how to exactly set this up though.
Here is a video for setting up and exporting LODs in Maya that should be useful. Personally I use Max, but this looks like it should get the job done for you.
If this method isn’t working for you, there are options to import your LODs manually.
You can do this by importing your base mesh then opening that via the content browser to the mesh viewer. In the details panel to the right you’ll see the option for Base LOD that’s a drop-down menu. When you select that you’ll get the option to import LOD 1 and so on.
The maximum number of LODs you can have is 4. Your base mesh plus three lower LODs.
If you have any questions feel free to ask!