How can i rename vuetify data-table group label?

I want to change group label of vuetify data-table. For earlier versions of Vuetify below the code was working fine but now it doesn’t work.

<va-data-table-server
  :items-per-page="50"
  :group-by="groupBy"
  row-create
  row-clone
  row-edit
  disable-edit
  disable-show
  disable-clone
  disable-create-redirect
>
  <template v-slot:column.data-table-group>
  </template>
</va-data-table-server>

How can i rename vuetify data-table group label

Here is demo link.

https://play.vuetifyjs.com/#eNq9lt9vmzAQx