Hi,
I found this other discussion in the forums: Bezier Curve from Blender as Path in Unity You can probably find some answers there. I’m not an expert in this, but I found something else that could help you: https://assetstore.unity.com/packages/tools/utilities/b-zier-path-creator-136082 This is a tool to create paths in Unity. You could try to rebuild the path with this tool in Unity, but I know that this solution is problably not the best one but maybe good enogh when compared with the time needed for other better solutions. Here is a tutorial for using the path creator:
https://www.youtube.com/watch?v=saAQNRSYU9k
I hope I could help you a little bit!