>>726
疑似要素でやってみた　位置調整と色は自分でしてね

#searchbar-engine-one-off-item-engine-1 {
position: relative !important;
}
#searchbar-engine-one-off-item-engine-1::after {
content: '';
position: absolute !important;
left: 38px !important;/* 線の左右位置 */
bottom: 5px !important;/*線の上下位置 */
width: 2px !important;/*線の太さ*/
height: 23px !important;/*線の長さ*/
transform: translateX(-50%) !important;
background-color: #eee !important;/*線の色*/
}

#searchbar-engine-one-off-item-engine-5 {
position: relative !important;
}
#searchbar-engine-one-off-item-engine-5::after {
content: '';
position: absolute !important;
left: 38px !important;
bottom: 5px !important;
width: 2px !important;
height: 23px !important;
transform: translateX(-50%) !important;
background-color: #eee !important;
}