Unfortunately it's not possible for Octane to use shader tree falloffs/texture locators in this way.
We can emulate the look with Octane nodes and some modo rigging, but it's a little complicated.
There's probably a few different ways to do it. I'm attaching a scene for you to study.
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Win10 Pro 64 / Core i7-975 3.33GHz / 12GB RAM / GTX 1080 Ti + GTX 670 / 2x1920x1200 / MODO 13
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