Vimwiki does supports tags, and allows multiple tags too. I added a request around 2 years ago to add support for custom delimiters for tags which too was added in the dev branch. I have been a happy user of vimwiki for the last 3-4 years and it works great. Use pandoc for conversion to html, has mathjax support for mathematical expressions along with support for mermaid-js too. For searching the notes i have been using leader-f with fzf, fd and rg.
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