They put protective armor plates over the engine. Then added 30mm to it... That enough info?
Ok, so they armored the FW 190.
Surprise, so did all other nations to their planes too. They added armor, self sealing fuel tanks and other equipment to make the planes more survivable.
Armanent? First production 190s had 4 x 7,92 machine guns and 2 x 20 mm cannons. Not unusually grand armanent.
All other nations also upgraded the weapons their various types had. So some variants of FW 190 got 30 mm? So what? That is a later modification. Wouldn't you think they put more and bigger guns to the first versions already, if they designed it for bomber killer?
Here's a secret: FW 190 was designed as front line fighter, to supplement Me 109. But it was so capable, it could be used for many roles.
By your own definition FW 190 was designed to be ground attack airplane, as it got more armor and was equipped bombs/rockets. That is enough info, right?
Kurt Tank himself, though...
The Messerschmitt 109 [sic] and the British Spitfire, the two fastest fighters in world at the time we began work on the Fw 190, could both be summed up as a very large engine on the front of the smallest possible airframe; in each case armament had been added almost as an afterthought. These designs, both of which admittedly proved successful, could be likened to racehorses: given the right amount of pampering and easy course, they could outrun anything. But the moment the going became tough they were liable to falter. During World War I, I served in the cavalry and in the infantry. I had seen the harsh conditions under which military equipment had to work in wartime. I felt sure that a quite different breed of fighter would also have a place in any future conflict: one that could operate from ill-prepared front-line airfields; one that could be flown and maintained by men who had had received only short training; and one that could absorb a reasonable amount of battle damage and still get back. This was the background thinking behind the Focke-Wulf 190; it was not to be a racehorse but a Dienstpferd, a cavalry horse.