No grinding necessary!
I've been using chia seeds in my baking/cooking for a few years now. I make chia gel all the time. My daughter loves it in her green tea. I have never had to grind my chia seeds--ever! Unlike flax seeds, chia seeds don't need to be ground to be used in recipes, including making egg replacement. We are GF in our house so we use a lot of eggs and chia gel is often used, along with flax, to make egg replacements. :)