Is there a way to rearrange an Object or Objects in Firebase real time database? (Firebase saves it in a sorted manner by keys)

I couldnt figure it out so this is what I am doing on the client side

1. Convert to array of Objects
2. Sort the array by property value (look below)
3. Change position (eg. from 4th to 1st) and update the required indexes
4. Loop through the array and update index on all elements on firebase

My loop for step 3 is a little too complicated, is there an effecient, ES6 way to achieve the same?

Step 1: Data from firebase:

[
    id1: {
        name: 'name1',
        index: 3
    },
    id2: {
        name: 'name2',
        index: 0
    },
    id3: {
        name: 'name3',
        index: 1
    },
    id4: {
        name: 'name4',
        index: 2
    }
]

Step 2: Sort it

const sortedList = list.sort((a, b) =>
    a.val.index > b.val.index ? 1 : b.val.index > a.val.index ? -1 : 0
  )

output = [
    id2: {
        name: 'name2',
        index: 0
    },
    id3: {
        name: 'name3',
        index: 1
    },
    id4: {
        name: 'name4',
        index: 2
    }
    id1: {
        name: 'name1',
        index: 3
    },
]

Step 3: This is where I need help with a function to update the indexes when moved from one position to another