What are you planning to do with the export? The only app that would read the Octane node would be Octane Standalone.
And to pre-empt you answer
I had a very very large Poser scene with Octane nodes, and there were 26,000 Octane nodes....so if you loaded that into Octane Standalone, there would be 26,000 nodes all on top of each other. So it would be a challenge to find or do anything with them.