BNW version of ToA gave both net AND gross food, making it my favorite wonder by far. Say you have 20 food for 5 pop. Without the wonder you grow at +10 leftover food. With it, 20 is first increased to 22, then the 12 food surplus is increased again to 13.2.If I recall correctly, the population growth bonus is only to the net food (not the gross food), which significantly limits how helpful it is.
If I remember right, back in Civ V, there were some bonuses that only helped with net food while a few (like Civ V Temple of Artemis) helped with gross food.
Only other thing which increased gross food was the Aztec UB floating gardens.
There is no real counterpart it CivVI unfortunately