How to add a final tabstop marker for vim.snippet (similar to LuaSnip’s ext_opts.exitNode)?

[narutozxp]

I’m using blink.nvim with the built-in vim.snippet engine instead of LuaSnip.
With LuaSnip, it’s easy to visually mark the final tabstop ($0) using ext_opts[types.exitNode], for example:

[types.exitNode] = {
  unvisited = {
    virt_text = { {'⇡', 'IndentBlanklineIndent4'} },
    virt_text_pos = 'inline',
    hl_mode = "combine",
  },
}

This makes the final tabstop visible immediately when the snippet expands, which is extremely helpful for complex snippets.

But with vim.snippet, I can’t find any way to:

• identify the final tabstop on expansion
• or attach a highlight/extmark to it
• or get tabstop positions like LuaSnip does

Is there any recommended way to implement a “final tabstop marker” with vim.snippet?
Or is this feature currently impossible without manually simulating jumps or scanning the inserted text?

Any guidance or ideas would be greatly appreciated!