Zoterolens scans Markdown files for citation-keys and adds inline links to open their attached pdf's with Zotero. An optional page number is taken into account.
I recommend using it in combination with an extension such as [Citation Picker for Zotero](https://marketplace.visualstudio.com/items?itemName=mblode.zotero), and/or [Pandoc Citer](https://marketplace.visualstudio.com/items?itemName=notZaki.pandocciter) to be able to easily add citations.