Hello! I'm back from my vacations ...but I'm going back to school tomorrow. x')
In the meantime I have been working on a new feature to detect some of the Fabric mods (be careful, this is only a small part, unlike forge detection). For now it's in beta and you can only see the log in the console and type /hs fabric check <Player>
Tell me if it works for you and if you want me to redesign an inventory visualization system like with forge.