Wouldn't jury nullification be restricted to finding someone not guilty because some law is invalid. This would be the opposite, where we find someone "guilty"

Wouldn't jury nullification be restricted to finding someone not guilty because some law is invalid. This would be the opposite, where we find someone "guilty" of "treason" because the jury decided treason is actually a broader crime that covers acts like lying about war crimes. Doesn't sound like jury "nullification" to me.