Is it possible to add a custom element at the end of each nested?

[Forbik]

Is it possible to add a custom element at the end of each nested? Thanks.
example

[phphe]

You can place it in last node. In slot, use node index to detect if it is last one.

<template #default="{ node, stat }">
  {{stat.parent.children.indexOf(node)}}
</template>