Deneb Visual Zooming

I have Figured out the solution to this and will paste the code below for anyone who would like to try mimic this.

Essentially, you are able to make a regression graph and make it zoomable but you just have to code within the same Layer ("layer" function). Please take a look below, at the code:

{
  "data": {"name": "dataset"},
  "layer": [
    {
      "mark": {
        "type": "point",
        "filled": true
      },
      "encoding": {
        "x": {
          "field": "X FIELD",
          "type": "quantitative",
          "axis": {"format": "%"}
        },
        "y": {
          "field": "Y FIELD",
          "type": "quantitative",
          "axis": {"format": "%"}
        },
        "color": {
          "field": "CLIENT COLOUR FIELD - IF THIS IS NOT APPLICABLE TO YOU, PLEASE TAKE IT OUT",
          "type": "nominal",
          "legend": null,
          "scale": {
            "range": [
              "#006D9E",
              "#A6E2EF"
            ]
          }
        }
      }
    },
    {
      "mark": {
        "type": "line",
        "color": "black"
      },
      "transform": [
        {
          "regression": "Y FIELD",
          "on": "X FIELD",
          "method": "pow"
        }
      ],
      "encoding": {
        "x": {
          "field": "X FIELD",
          "type": "quantitative"
        },
        "y": {
          "field": "Y FIELD",
          "type": "quantitative"
        }
      }
    },
    {
      "transform": [
        {
          "regression": "Y FIELD",
          "on": "X FIELD",
          "params": true,
          "method": "pow"
        }
      ],
      "mark": "circle",
      "encoding": {
        "x": {
          "field": "X FIELD",
          "type": "quantitative"
        },
        "y": {
          "field": "Y FIELD",
          "type": "quantitative"
        }
      },
      "params": [
        {
          "name": "grid",
          "select": "interval",
          "bind": "scales"
        }
      ]
    }
  ]
}