How to get Item Index to functions in v-list-item-action in the Vuetify?

[HanwGeek]

I want to get the item index as a param to the function in the v-list-item-action. But how? Thanks!

<v-list-item
  v-for="(layer, i) in layers"
  :key="i">
<template v-slot="{ item, index }">
<v-list-item-action>
  <v-btn 
    @click="changeVisible(index)"
    icon>
    <v-icon
      color="blue darken-2"
      v-if="layer.show">
      mdi-eye
    </v-icon>
    <v-icon
      v-else>
      mdi-eye-off
    </v-icon>
  </v-btn>
</v-list-item-action>
<v-list-item-title v-text="layer.name"></v-list-item-title>
<v-list-item-action>
  <v-btn
    @click="changeEdit" 
    icon>
      <v-icon
      color="blue darken-2"
      v-if="layer.edit">
      mdi-pencil
    </v-icon>
    <v-icon
      v-else>
      mdi-pencil
    </v-icon>
  </v-btn>
</v-list-item-action>
</template>
</v-list-item>

[sugoidesune]

v-for="(layer, loop_index) in layers"

...

changeVisible(loop_index)