Lava rock in garden beds

I went to Santorini a few years ago and they talked about how planting their tomatoes in the mineral rich lava rock helps add flavor and helps retain water since they hold water in their pores. They get little rain and the rock holds water. They often find the roots wrapped tightly around rock which helps break it down as well. Has anyone added lava rock not specifically for drainage or weed/pest control and more to add minerals or help with water retention during a drought?