I know sodium is meant for clients, not servers, but it would be cool to see some of the features that sodium offers (mainly multithreaded chunk loading) for servers. Idk if it's possible, but that's why I'm asking

For servers, I mean running a server with mutlithreaded chunks

Sodium's features are purely rendering related. I expect you're talking about chunk building, not chunk loading, which is a fundamentally different thing. Trying to multithread chunk loading is incredibly difficult to get right and is not something Caffeine mods are likely to attempt.