My sister, who keeps reptiles, breeds Dubia roaches and tells me that they have a much superior protein to fat ratio.
My chickens love them.
They are also willing to forage in the bedding for a handful of pellets.
I've always wanted to get into breeding crickets and other insects that are "gut loaded" for chickens. I imagine dubia roaches on a really good diet would be a great source of all sorts of goodies for chickens.