Houdini -> threejs with GLSL shader

I’m working on building a Houdini → threejs pipeline. I currently have the problem that the Houdini viewport or the available shaders do not display the same result as threejs. The materials are already baked onto PBR maps.
Houdini offers the option of loading GLSL code via custom nodes… is it easy to generate a suitable GLSL file from a threejs shader or does it require a lot of hacking? I’m not yet familiar with writing shader code.

Thank you for your help!
Best regards