Using Variables on Compass Aggregation tool

Hello, I’m using Mongodb Compass v1.41.0, and would like to know if there is a way to use and define variables on aggregations tab, I created a script for data analysis and uses some values multiple times, sometimes I need to change those values, and is annoying to change these on all stages, is there any way to use variables or any idea that may solve the issue? Thanks in advance

oh sorry, here. I would like to create variables for “Entry Date” and “Source” fields

[
  {
    $match:
      /**
       * query: The query in MQL.
       */
      {
        Source: "Clientx",
        "Entry Date": {
          $gte: ISODate(
            "2024-06-01T04:00:00.000+00:00"
          ),
          $lte: ISODate(
            "2024-07-01T04:00:00.000+00:00"
          ),
        },
      },
  },
  {
    $facet:
      /**
       * outputFieldN: The first output field.
       * stageN: The first aggregation stage.
       */
      {
        TotalClicks: [
          {
            $group: {
              _id: "$Source",
              TotalClicks: {
                $sum: 1,
              },
              TotalCost: {
                $sum: "$Cost",
              },
            },
          },
        ],
        UniqueIps: [
          {
            $group: {
              _id: "$IP Address",
            },
          },
          {
            $count: "UniqueIps",
          },
        ],
      },
  },
  {
    $unwind:
      /**
       * path: Path to the array field.
       * includeArrayIndex: Optional name for index.
       * preserveNullAndEmptyArrays: Optional
       *   toggle to unwind null and empty values.
       */
      {
        path: "$TotalClicks",
      },
  },
  {
    $unwind:
      /**
       * path: Path to the array field.
       * includeArrayIndex: Optional name for index.
       * preserveNullAndEmptyArrays: Optional
       *   toggle to unwind null and empty values.
       */
      {
        path: "$UniqueIps",
      },
  },
  {
    $project:
      /**
       * specifications: The fields to
       *   include or exclude.
       */
      {
        Source: "$TotalClicks._id",
        Total_Cost: "$TotalClicks.TotalCost",
        Total_Clicks: "$TotalClicks.TotalClicks",
        Unique_Clicks: "$UniqueIps.UniqueIps",
        Duplicate_Rate: {
          $concat: [
            {
              $toString: {
                $multiply: [
                  {
                    $round: [
                      {
                        $divide: [
                          {
                            $subtract: [
                              "$TotalClicks.TotalClicks",
                              "$UniqueIps.UniqueIps",
                            ],
                          },
                          "$TotalClicks.TotalClicks",
                        ],
                      },
                      4,
                    ],
                  },
                  100,
                ],
              },
            },
            "%",
          ],
        },
      },
  },
]