LikesBy.Json

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "style": {
    "margin": "3px"
  },
  "children": [
    {
      "elmType": "div",
      "style": {
        "padding": "5px 10px 5px 10px",
        "cursor": "pointer",
        "white-space": "nowrap",
        "border-radius": "5px",
        "display": "flex",
        "align-items": "center"
      },
      "attributes": {
        "class": "ms-bgColor-themePrimary ms-bgColor-themeTertiary--hover ms-fontColor-white"
      },
      "children": [
        {
          "elmType": "span",
          "style": {
            "font-size": "15px",
            "margin-right": "5px"
          },
          "attributes": {
            "iconName": "Contact"
          }
        },
        {
          "elmType": "span",
          "txtContent": "いいね! したユーザー"
        }
      ],
      "customCardProps": {
        "openOnEvent": "hover",
        "directionalHint": "rightCenter",
        "isBeakVisible": true,
        "formatter": {
          "elmType": "div",
          "style": {
            "max-height": "300px",
            "padding": "5px 20px 5px 20px",
            "display": "flex",
            "flex-direction": "column"
          },
          "children": [
            {
              "elmType": "div",
              "txtContent": "= if([$LikesCount] == '' , '0' , [$LikesCount]) + ' 件の いいね!'",
              "style": {
                "padding": "10px",
                "font-weight": "bold",
                "font-size": "15px"
              }
            },
            {
              "elmType": "div",
              "children": [
                {
                  "forEach": "personIterator in [$LikedBy]",
                  "elmType": "div",
                  "style": {
                    "margin-bottom": "5px",
                    "display": "flex",
                    "align-items": "center"
                  },
                  "children": [
                    {
                      "elmType": "img",
                      "style": {
                        "width": "32px",
                        "height": "32px",
                        "border-radius": "50%",
                        "margin-right": "5px"
                      },
                      "attributes": {
                        "src": "=getUserImage([$personIterator.email], 'S')",
                        "title": "[$personIterator.title]"
                      }
                    },
                    {
                      "elmType": "span",
                      "txtContent": "[$personIterator.title]"
                    }
                  ]
                }
              ]
            }
          ]
        }
      }
    }
  ]
}