Is there any more natural way to go without layer feed that would be more balanced
More balanced than layer feed? No.
More balanced than sprouting a mix of grains and lentils? Maybe, but it won't be easy or cheap.
If you want the cheapest thing that is properly balanced to keep your chickens healthy, then buy layer feed, or chick starter, or grower. Offer a separate dish of oyster shell, and provide water at all times. That's the best for cheap, easy, & healthy.
The layer feed is meant to provide everything a layer needs, but the chick starter or grower will provide everything except calcium, and will have a higher level of protein than layer feed.
chickens in the wild do not eat pre bagged feed they eat what’s in their environment
Chickens in the wild don't lay as many eggs, either.
Since most domesticated chickens have been bred to lay more eggs, they have different nutritional needs than the wild chickens.
Also, wild chickens would be able to forage over a much larger area than people usually provide for their domestic chickens.
If you really want to have healthy chickens without purchasing a bag of "chicken feed," you could try something like:
--buy 1 acre of land per chicken
--have grass & weeds on 1/3 of that land
--have forest on 1/2 of that land
--have a giant compost pile with lots of bugs & worms on the remaining 1/6 of that land
--provide water, oyster shell, and mixed grains
--no winter
--no predators
I haven't actually tried this, so you might need a slightly different amount of land, but I think that's about what it would take. The "no predators" part would probably be difficult to arrange, and winter would probably require supplemental feed in most areas, because there is less for the chickens to forage, even if it's not buried under snow.