How to avoid variadics

class DiscordInterface : public NetworkInterface
{
public:
    struct Options {
        const char *client_id;
    };

public:
    DiscordInterface(Options &options);
    ~DiscordInterface();
};

//Some other class's method
template<class NetworkClass>
void initNetwork(typename NetworkClass::Options opt)
{
    _network = std::make_unique<NetworkClass>(opt);
}

//Caller
game.initNetwork<DiscordInterface>({.client_id = "5090046****195668"});