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Try to forward the slots from the v-datatable by iterating over them, then creating new ones that can be accessed in parent component :
<v-data-table :headers="headers" :items="items">
<template v-for="(_, scopedSlotName) in $scopedSlots" v-slot:[scopedSlotName]="slotData">
<slot :name="scopedSlotName" v-bind="slotData" />
</template>
</v-data-table>
Source:stackexchange.com