Variable in GraphQL bulk operation?

[few_meaning]

I'm trying to run a bulk operation that has a variable in it. It's almost identical to the example here: https://shopify.dev/api/usage/bulk-operations/queries except the query has a variable in it, e.g.:

mutation BulkOrders($created_at: String!) {
  bulkOperationRunQuery(
    query:"""
    {
      products(query: $created_at) {
        edges {
          node {
            id
          }
        }
      }
    }
    """
  ) {
    bulkOperation {
      id
      status
    }
    userErrors {
      field
      message
    }
  }
}

Is there any way for this to work? Trying to invoke it as is, with a variable like:

{
  "created_at": "created_at:>'2022-04-22T00:00:00'"
}

yields:

{
  "errors": [
    {
      "message": "Variable $created_at is declared by BulkOrders but not used",
      "locations": [
        {
          "line": 1,
          "column": 1
        }
      ],
      "path": [
        "mutation BulkOrders"
      ],
      "extensions": {
        "code": "variableNotUsed",
        "variableName": "created_at"
      }
    }
  ]
}

I guess the string in `bulkOperationRunQuery` has to be static, so this is impossible? Is there any way to do a parameterized bulk query (beyond generating one per variable value dynamically at run time)?

[few_meaning · Accepted solution]

The `query` string is static. Parameters cannot be resolved within the query string, so the query must be built dynamically on the GraphQL client side.