Any way to get variables' value in custom commands?

As an alternative solution you can adapt the GitHub macro example I made at the end of this post:

Macros support <%current page%>

Advantages:

  • You can just place something like {{wikipedia}} in any page
  • You can set a custom command so that when you start tying /wiki it will print {{wikipedia}}
  • You can style it with Hiccup (basically HTML/CSS with a Clojure-like syntax)
  • Native i.e. no plugins needed

Disadvantages:

  • It works only in Logseq while other Markdown editors will just display {{wikipedia}}
  • If a Wikipedia URL is slightly different from your page name you won’t be able to manually adjust the link