BetterEnd/src/main/resources/assets/betterend/blockstates/chorus_plate.json

{
    "variants": {
        "powered=false": {
            "model": "betterend:block/chorus_pressure_plate_up"
        }, 
        "powered=true": {
            "model": "betterend:block/chorus_pressure_plate_down"
        }
    }
}