Inline tags have been implemented in Logseq DB some alpha versions ago (you can decide per tag where it shows), so I’ll close this request.
For now, please don’t post feature requests for Logseq DB as it’s still in development. We have a limited group of alpha testers to give us feedback, as it’s impossible for our small dev team to keep up if everybody is going to give feedback at this stage. And in this particular case, this feature has already been added.