Not LaTeX snippets, but in terms of fast LaTeX typing, I just created a plugin (Logseq Live Math) that integrates MathLive with Logseq. MathLive is a great library that provides an intuitive, rich, and fast LaTeX experience. MathLive also provides great support for keyboard shortcuts and inline shortcuts.
Hope this plugin can help you!
Edited: Remove links to avoid stupid and unfriendly “post hidden”