docs: function findItemInDataForExpansion (label) {
      for (let i = 0; i < data.length; i++) {
          if (data[i].label === label) {
              let item = data[i];
              let offset = data.filter(d => d.parent === item.parent).findIndex(d => d.id === item.id);
  
              return {
                  parent: item.parent,
                  id: item.id,
                  children: item.children,
                  offset: offset
              };
          }
      }
  }