My first time ever using chickpea flour (ground it up in the bullet and sifted) I started with a recipe in mind using half chickpea and half oat flours. Basically put the full volume of warm water and spices and oil in with the chickpea flour and left it out to soak for about 5 hours, whisking the batter a few times during that time then added the oat flour and stuck it all in the fridge overnight. This morning I had to add more oat flour, and a little more oat flour, and a little more oat flour, and another splash of oil, but the dough was still sticky, so I went ahead and kneaded it with several dustings of whole wheat flour until it felt right. These are so tasty, but not as pliable as the pure oatmeal roti/chapati. I had read that chickpea chapati will be firm, but the oatmeal helped with a bit of foldability.
Here's the original Oats Chapati recipe.