{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "children": [
    {
      "elmType": "button",
      "customRowAction": {
        "action": "setValue",
        "actionInput": {
          "Value": "=[$Value]+1"
        }
      },
      "attributes": {
        "class": "ms-fontColor-themePrimary ms-fontColor-themeDark--hover",
        "title": "Increase value"
      },
      "style": {
        "border": "none",
        "background-color": "transparent",
        "cursor": "pointer"
      },
      "children": [
        {
          "elmType": "span",
          "attributes": {
            "iconName": "CirclePlus",
            "class": "ms-font-xl"
          }
        }
      ]
    },
    {
      "elmType": "button",
      "customRowAction": {
        "action": "setValue",
        "actionInput": {
          "Value": "=[$Value]-1"
        }
      },
      "attributes": {
        "class": "ms-fontColor-themePrimary ms-fontColor-themeDark--hover",
        "title": "Decrease value"
      },
      "style": {
        "border": "none",
        "background-color": "transparent",
        "cursor": "pointer"
      },
      "children": [
        {
          "elmType": "span",
          "attributes": {
            "iconName": "Blocked2",
            "class": "ms-font-xl"
          }
        }
      ]
    }
  ]
}