These statement completions seem to be quite old, but I've never seen them being offered as part of any completion request.
I just checked what is currently being returned, and this is not part of the result:
I also installed vscode, in case neovim somehow didn't support this, but the result is the same:
According to the diff, this requires placeholders, but adding usePlaceholders to both vscode and neovim didn't make a difference for the results, though I'm not sure that placeholders are worth it for me even for this feature (they require a different workflow from what I'm used to)
Snippets are enabled and working in both neovim and vscode. Both non lsp snippets and ones coming from gopls. The latter was quite visible when I enabled placeholders and was able to jump between the various positions.
The vscode config is empty (fresh install to test this), except for the 3 lines needed to enable placeholders. I'm not in front of a computer right now, so I can't actually post it.