minecraft-kajetans-mod/src/main/resources/assets/km/blockstates/coarse_dirt_slab.json

{
    "variants": {
        "type=bottom": { "model": "km:block/slab/bottom_slab_coarse_dirt" },
        "type=top": { "model": "km:block/slab/upper_slab_coarse_dirt" },
        "type=double": { "model": "block/coarse_dirt" }
    }
}