Portrait Segmentation

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How can I get the portrait segmentation texture to display on an image object? Like the Face Inset, but with the neck, shoulders and chest displaying?

You can see that I use the Face Inset in this lens. But how can I get the upper body to display?

https://www.snapchat.com/unlock/?type=SNAPCODE&uuid=80c372c815d741e79d78279366608e92&metadata=01