A short video tutorial was presented at Siggraph 2018 de Liz Mercuri (Technical Evangelist, Unity Technologies), see this video tutorial:
Let's see how to use this asset.
First, you need to download and import it from Unity Store.
Search using the name of this asset FBX Exporter from Unity.
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Use import option to use this asset.
To start this asset use from menu: Edit - Project Settings - Fbx Export.
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This will open this asset into Inspector area:
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You can use just Maya and 3D studio Max 3D software to work with this asset.