can I put a nodejs+express app to static website?

I have a website domain and have a static portfolio website. Then, I made a small program with NodeJS + Express by using APIs.

My question is that, how can I link my program to my website? I only linked to my gitHub repo but I want to actually have the program on my website as well so people can try it.

I was thinking about it and I could think that maybe I should re-create my portfolio website by using NodeJS + Express and route from there to my program...

Any help/tip I'll appreciate. Thanks.