I would mix it with other grains and seeds to kinda balance the feed . You said your chickens like oats ...... that's unusual as i have a hard time getting chickens to eat dry oats .Can you just solely feed laying chickens whole oats? I just bought a 50 pound bag thinking I would use it as feed without evening knowing if it's ok. I would also feed them crushed egg shells as a calcium supplement.
Now i can soak them about three day (might be smelly) but the chickens go bonkers over them , thereafter will eat them dry (lol).
protein in oats is usually going to be below 12% because oats WithOut hulls can range in protein from 12% up to 24% .
Whole Oats is considered a valuable grain in that it has fiber with the groat that most grains and seeds don't have making it a better balance than any other single grain . Also the protein from oats is more like the protein in milk , meats and etc that other grains don't have .