A way to set rust-analyzer snippets in Emacs

I recently realized that the postfix snippets proposed by hints where coming from rust-analyzer (as described here).

I was wondering if anyone knew how I could configure my LSP client to send the rust-analyzer.completion.snippets.custom variable with lsp-mode.

My initial search of the internet came back empty.

Links:

If you think that might request is well founded and you share my interest, I opened two issues where you can join the discussion :

  1. rustic
  2. lsp-mode