Vega Address search

spec.json

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "width": 500,
  "padding": 5,
  "signals": [
    {
      "name": "address_input",
      "value": "",
      "bind": {
        "placeholder": "Search for an address",
        "input": "text",
        "name": "Address",
        "debounce": 300
      }
    }
  ],
  "data": [
    {
      "name": "results",
      "url": {
        "signal": "'https://nominatim.openstreetmap.org/search?format=json&q=' + address_input"
      }
    }
  ]
}