minecraft-assets/assets/minecraft/models/block/fire_side_alt.json

{
    "ambientocclusion": false,
    "elements": [
        {   "from": [ 0, 0, 0.01 ],
            "to": [ 16, 22.4, 0.01 ],
            "shade": false,
            "faces": {
                "south": { "uv": [ 16, 0, 0, 16 ], "texture": "#fire" },
                "north": { "uv": [ 16, 0, 0, 16 ], "texture": "#fire" }
            }
        }
    ]
}