Get typedef from parameter pack

I have a struct of this form:

template <typename T>
struct X
{
    using value = T;
};

I am passing one or more of these to a template function like this:

template <typename... Ts>
void Func(Ts... ts);

What I really want is to explicitly list the Xs and have the function parameter types be the values of the Ts. How would I do that?