I want to add react code into markdown files

Question

I have a static website generated by Docusaurus and I added firebase authentication it works fine but the path to my markdown files still not secured (everyone can access it without authentication). Is it possible to add this code to markdown files ?

..
const [user, loading, error] = useAuthState(auth);
  const navigate = useHistory();

  useEffect(() => {
    if (loading) return;
    if (!user) return navigate.push("/");
  }, [user, loading]);
..

Please any help to make this possible