grupo por design tabela em negrito
<template v-slot:group.header="{ group, headers, toggle, isOpen }">
<td :colspan="headers.length">
<v-btn @click="toggle" x-small icon :ref="group">
<v-icon v-if="isOpen">mdi-plus</v-icon>
<v-icon v-else>mdi-minus</v-icon>
</v-btn>
<span class="mx-5 font-weight-bold">{{ group }}</span>
</td>
</template>
Purple Team