generic-youtube-embed.json

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "children": [
    {
      "elmType": "div",
      "style": {
        "cursor": "pointer",
        "border-radius": "7px",
        "padding": "5px 10px",
        "display": "=if(@currentField,'flex','none')",
        "align-items": "center"
      },
      "attributes": {
        "class": "ms-fontSize-s ms-fontColor-white ms-bgColor-themePrimary ms-bgColor-themeTertiary--hover"
      },
      "customRowAction": {
        "action": "embed",
        "actionInput": {
          "src": "[$YouTube]",
          "width": "640",
          "height": "360"
        }
      },
      "children": [
        {
          "elmType": "span",
          "style": {
            "margin-right": "5px"
          },
          "attributes": {
            "iconName": "MSNVideosSolid"
          }
        },
        {
          "elmType": "span",
          "txtContent": "Watch YouTube"
        }
      ]
    }
  ]
}