Took me way too much effort to figure this out and searching for info resulted in a lot of posts with other people asking the same question or outdated information as LazyVim has changed its plugins a bunch of times, hopefully this helps someone else out there.

This example will use the template I'm using for my blog posts and is compatible with the Blink plugin that LazyVim is using for completions (under Extras) in 2025.

mkdir ~/.config/nvim/snippets
touch ~/.config/nvim/snippets/markdown.json

{
  "pelican-post": {
    "prefix": "post",
    "body": [
      "Title: ${1:Post Title}",
      "Date: $CURRENT_YEAR-$CURRENT_MONTH-$CURRENT_DATE $CURRENT_HOUR:$CURRENT_MINUTE",
      "Category: ${2:General, Projects}",
      "Tags: ${3:aws, python, vim}",
      "Status: ${4:draft, published, hidden, skip}",
      "Summary: ${5:Brief description}",
      "",
      "$0"
    ],
    "description": "Pelican blog post"
  }
}

Now you should be able to open up a Markdown file, type post<Tab> and have the snippet appear. You should be able to tab through the fields too.