Procesamiento de JSON y datos de matriz

let data = {a:123,
            b:234,
            c:345,
            houseId:ZZ19950116}
let arr = []
let index = 0
for(let i in data){
    if(i == '123' || i == '234' ||i == '345'){
        index++
        let arrayJson = {}
        arrayJson.itemId = index
        arrayJson.payAccount = data[i]
        arr.push(arrayJson)
    }
}

console.log(arr)   
// [
    {
      itemId:1,
      payAccount:123
    },{
      itemId:2,
      payAccount:234
    }{
      itemId:3,
      payAccount:345
    }
   ]