Layer Pellets are designed so a hen gets everything she needs, if she eats as many pellets as she wants and has nothing else but water.
If you limit the pellets, the hens will be short of something (maybe protein, maybe calcium or iron, maybe one vitamin or another-- I cannot predict it, because I don't know exactly how much of what they are getting from the other foods they eat.)
If you are trying to save money, skip the mealworms and chia seeds, and let the chickens have as many layer pellets as they want. Layer pellets are usually much cheaper than mealworms or chia seeds, AND are better balanced nutritionally for chickens.
If you are worried about the chickens getting fat, you should also skip the mealworms and chia seeds and just let the chickens have all the layer pellets they want.
Kitchen scraps vary a lot from one houshold to another, so I can't say whether you should limit them or not. It should be fine for chickens to have as much as they want of some things (like carrot peels), but they might have trouble with large amounts of other things (like the salty fat that drips out of a ham.)
As someone else already pointed out, each hen normally needs about 4 ounces (1/4 pound) of layer pellets each day, which would mean about 40 pounds per month for 5 hens. They may eat a bit more or less than that, but if your hens eat a lot more than that you should check whether they are spilling it, or whether something else is eating it too (like wild birds, squirrels, mice or rats, etc.)