Hi, FYI I do "everythings" in 3D in blender and everythings in 2D Grid in Tiled. They are both very generic and Level design should be just data.
1. Modeling and making meshs
2. Add properties to node
3. Read it and convert to jME3 format (you should use a customizable asset loader). Logic and properties -> States, Controls, Components. 3D Mesh, Textures, Shader -> Mesh, Textures, Shaders (of course)
4. Additional editing in SDK with Spatial Properties
5. Click the Run button. Profit!