Display Link to Google Maps

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "style": {
    "display": "flex",
    "flex-direction": "row"
  },
  "children": [
    {
      "elmType": "span",
      "txtContent": "@currentField"
    },
    {
      "elmType": "a",
      "style": {
        "min-width": "28px",
        "min-height": "28px",
        "border-radius": "50%",
        "display": "=if(@currentField=='','none','flex')",
        "justify-content": "center",
        "align-items": "center",
        "font-size": "16px",
        "cursor": "pointer",
        "text-decoration": "none",
        "margin-left": "10px"
      },
      "attributes": {
        "iconName": "POI",
        "class": "ms-bgColor-themeLighter ms-fontColor-neutralSecondary ms-bgColor-themePrimary--hover ms-fontColor-white--hover",
        "href": "='https://maps.google.com/maps?q='+@currentField",
        "target": "_blank"
      }
    }
  ]
}