Where do you store static data frontend or backend?

Let's assume there is a form frontend, which has several dropdowns with data(objects, not just strings) that likely not changing in the future, but it has reasonably size, so it looks a little bit weird putting it into frontend.

Do you create tables for these data backend and fetch it from there even though the backend likely not using or changing it ever?

Could you give me some resources where I can find about these conventions?