How can I sum the values on Power BI Deneb?

I have a table with the values that I want to display on Power BI Deneb Bar chart.

But the values are not aggregating Values stacked one above the others , the value displayed should be 20.439 instead of 18530/929/980 separated on the same bar.

I'm using the following specification:

{
  "data": {"name": "dataset"},
  
  "layer":[{
      "mark": "bar"},
    {
      "mark": {"type": "text", "color": "black", "xOffset": 8},
        "encoding": {
          "text": {"field": "PrimaryQuantityLoss", "type": "quantitative"}}
    }]
  ,
  
  "encoding": {
    "x": {
      "field": "PrimaryQuantityLoss",
      "type": "quantitative"
    },
    "y": {
      "field": "LossReason",
      "type": "ordinal"
    }
  }
}

I tried to do an aggregate by sum, but doesn't worked.

Change "PrimaryQuantityLoss" to "Sum of PrimaryQuantityLoss". As below, we can do it manually.

(1) Go to Visualizations > Values > "PrimaryQuantityLoss" and select Sum.

(2) Then a message window will appear to set the Field. Select Sum of PrimaryQuantityLoss as newly assigned field.

(3) Done. You will notice that the text encoding and the x-field are both renewed.

New specification is:

{
  "data": {"name": "dataset"},

  "layer":[{
      "mark": "bar"},
    {
      "mark": {"type": "text", "color": "black", "xOffset": 8},
        "encoding": {
          "text": {"field": "Sum of PrimaryQuantityLoss", "type": "quantitative"}}
    }]
  ,

  "encoding": {
    "x": {
      "field": "Sum of PrimaryQuantityLoss",
      "type": "quantitative"
    },
    "y": {
      "field": "LossReason",
      "type": "ordinal"
    }
  }
}