Helllo smrus852,
just stumbled upon your post by chance.
I run a setup with an NVIDIA 2080 Super and run Ollama, Open WebUI and Flowise without any issues. Unraid and the Custom Apps System allows for this very easily.
There is a plugin which is called Nvidia-Driver which makes it dead simple to support Nvidia and Cuda and passthrough to docker containers.
I attached a screenshot of the installed plugin and its settings. It takes like 2 clicks to install it.
Hope that helps!