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As others have pointed out Obsidian is using MathJaX, which is a custom implementation of a subset of TeX. It doesn't support Tikz, which is way different from the equation subset of TeX, but there is a discussion here: https://github.com/mathjax/MathJax/issues/41
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This was my first thought, but the last comment in that page linked above is promising. Someone has the real tikz running in the web browser, rendering to svg: https://github.com/kisonecat/tikzjax It might a simple matter of translating tikz-fenced code blocks to the appropriate script tag and letting that script do its thing.
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SurveyJS
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obsidian-latex-environments
Quickly insert and change latex environments within math blocks in Obsidian.
You maybe referring to this plugin.
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mermaid
Generation of diagrams like flowcharts or sequence diagrams from text in a similar manner as markdown
mermaid cannot render basic math symbols as pointed out in this GitHub issue. So it will be very messy to produce something like what OP wants.