Hi , @florence023 thanks for the response but its not working,
in my case this format is working but only for specific value like true / false not for the $exists operation

{
  "$or": [
    {
      "updateDescription.updatedFields": {
        "usdcLiquidation.level1": "true"
    }
    },
    {
      "updateDescription.updatedFields": {
        "usdcLiquidation.level2": "true"
    }
    },
    {
      "updateDescription.updatedFields": {
        "usdcLiquidation.level3": "true"
    }
    },
    {
      "updateDescription.updatedFields": {
        "usdtLiquidation.level1": "true"
    }
    },
    {
      "updateDescription.updatedFields": {
        "usdtLiquidation.level2": "true"
    }
    },
    {
      "updateDescription.updatedFields": {
        "usdtLiquidation.level3": "true"
    }
    },
    {
      "updateDescription.updatedFields": {
        "btcLiquidation.level1": "true"
    }
    },
    {
      "updateDescription.updatedFields": {
        "btcLiquidation.level2": "true"
    }
    },
    {
      "updateDescription.updatedFields": {
        "btcLiquidation.level3": "true"
    }
    }
  ] 
}