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Depending on where you live (i.e. availability of free range foods), then you don't really need to give them anything extra.
We don't feed our chickens anything at all (maybe a handful of rice or two per day between 70 chickens) and whatever food scraps we have left over.
They find all their own food, we do put out crushed egg shells (from hatched chicks), they rarely eat much of it but they do peck at the membranes.
Sometimes, we build termite 'traps' (piles of wet wood on the ground) and then we open them up as a special treat for the girls with chicks but they all seem to do just fine doing exactly what wild birds would do; eating whatever they can find.
We live in a hot country with no cold winter, it's never below 22C here and we have more bugs and creepy crawlies than you can imagine. There is an endless supply of food for the chickens. If you don't have that luxury then you may need to provide supplements, but most bugs are high in calcium (they need it to fly for some reason that I can't remember) so it's probably not calcium you'd be worring about anyway.
Make a nice Rooster sculpture out of the Plaster Of Paris, paint it and sell it at the local market then buy some chicken feed if you think they need it.
You're one of the lucky ones where the environment is ideal for chickens to survive, and where chicken ancestors emerged. 22c year round, whew! That's summer day temps! LOL