Tooltip de gráfico de barras

<figure class="uv-tcb"><figcaption>Visitas esta semana</figcaption><div class="ch"><button type="button" style="--v:42" data-d="L" data-v="1302" data-p="0" aria-label="L: 1302 visitas"><i></i><span>L</span></button><button type="button" style="--v:64" data-d="M" data-v="1984" data-p="52" aria-label="M: 1984 visitas"><i></i><span>M</span></button><button type="button" style="--v:51" data-d="X" data-v="1581" data-p="-20" aria-label="X: 1581 visitas"><i></i><span>X</span></button><button type="button" style="--v:88" data-d="J" data-v="2728" data-p="73" aria-label="J: 2728 visitas"><i></i><span>J</span></button><button type="button" style="--v:73" data-d="V" data-v="2263" data-p="-17" aria-label="V: 2263 visitas"><i></i><span>V</span></button><button type="button" style="--v:97" data-d="S" data-v="3007" data-p="33" aria-label="S: 3007 visitas"><i></i><span>S</span></button><button type="button" style="--v:58" data-d="D" data-v="1798" data-p="-40" aria-label="D: 1798 visitas"><i></i><span>D</span></button><span class="tt" aria-hidden="true"><b>0</b><span class="dl">0 %</span></span></div></figure>