Macro to call member function defined by another macro (variadic templates)

I have an existing macro, which I can't modify, used to define member functions from their addresses (reverse engineering):

#define DEFINE_FUNCTION(className, fnName, retnType, addr, ...) \
    template <class... Params>                                  \
    __forceinline retnType fnName(Params&&... params) {         \
        typedef retnType(className::*Fn)(__VA_ARGS__);          \
        const static uintptr_t address = addr + g_baseAddr;     \
        Fn fn = *(Fn*)&address;                                 \
        return (this->*fn)(params...);                          \
    }

How to call functions defined by this macro using another macro? It would be awesome if the new macro used this "signature" for backwards compatibility with old macro:

#define CALL_FUNCTION(obj, fn) /* stuff */

and could be used like that:

CALL_FUNCTION(this, Fn)( /* varargs /* );

I made this one and it works for normal members but it doesn't for the ones defined with variadic template macro:

#define CALL_FUNCTION(obj, fn)   (obj->*(obj->fn))()