How to add output parameter in vega chart?

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1

I am making a heat map with vega chart. In the chart, I want to select a point and use it as a output. So, I added below script and set up the parameter to SELECTION section of the vega chart widget.
Heat map is shown on the chart successfully. But when I added below script, heat map is not shown on the chart.
Please, let me know how to solve this problem.

“params”: [
{
“name”: “quiverDefaultClick”,
“select”: {
“type”: “point”,
“encodings”: [“x”, “y”]
}
}
]