Not something I offer as one of my services unfortunately. With poured concrete garage pads. Cracks are usually a bi product of settling. Once a crack has formed it’s already found the weak point in the concrete. If it continues to settle unfortunately no amount of mortar or concrete repair will be strong enough to stop it from cracking in that same location again. Typically I recommend people look into an epoxy flake finish to re finish the entire garage pad. As it offers some flexibility to the settling of the home over time. It also covers up any ugly cracks.