If you specifically want to go the ONNX path, you should be able to export to ONNX using instructions here 21.
Once it’s in ONNX format you can load it through our Loader class, and run it on any Glow backend (assuming it has sufficient support) using instructions here 22. However note that it sounds like you will need to build your own custom Loader class for this (perhaps similar to our text-translator which you can find info about in the above link).