qmk_firmware/keyboards/bastardkb/charybdis/info.json

{
    "rgb_matrix": {
        "animations": {
            "cycle_left_right": true
        },
        "default": {
            "speed": 32,
            "val": 64
        },
        "sleep": true
    },
    "split": {
        "transport": {
            "sync": {
                "matrix_state": true
            }
        }
    }
}