No, this version of Panda does not support wikilinks or tags. You can, however, use a direct file link, e.g. file:///Users/... as the url. That’s obviously not ideal but it gets you part of the way there.
The team is working on an updated version of Panda that will presumably support wikilinks, tags, and more: https://community.bear.app/t/panda-sneak-peek-a-work-in-progress-markdown-editor-and-library