{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "a",
  "attributes": {
    "href": "='https://teams.microsoft.com/l/chat/0/0?users=' + join(@currentField.email,',') + '&topicName=' + [$FileLeafRef] + '&message=Neigh?'",
    "class": "ms-fontColor-themePrimary ms-fontColor-themeDark--hover",
    "title": "='Start a chat with ' + join(@currentField.title, ', ')"
  },
  "style": {
    "text-decoration": "none"
  },
  "children": [
    {
      "elmType": "span",
      "attributes": {
        "iconName": "SurveyQuestions"
      },
      "style": {
        "padding-right": "4px"
      }
    },
    {
      "elmType": "span",
      "txtContent": "Ask a Question"
    }
  ]
}