I found that Markdown has something called reference-style links. I don't know if is it official Markdown syntax or it exists only in some Markdown add-ons.
I tried to create something like that in VSCode, but it doesn't work:
[Test][ducksearch]
[ducksearch]: https://duckduckgo.com
I wonder is it a bug/un-implemented function in VSCode or that syntax works only with some extension?