Export Separated elements from SpeedTree

Hi guys !

I’m trying to make an html 5 export and in my scene I want to put a tree but the basic export of speedtree doesn’t work I can see the mesh but not the textures as html5 doesnt seems to really appreciate submaterials.
To make this work I would like to export my trees from speedtree by separating the different elements that makes the tree. (Leaves/Bark)
Is there any way to do so?

Thanks in advance guys !