I believe the new request here was described in a confusing way. Inline LaTeX is certainly available since a few releases ago. What’s most needed is some kind of preview that renders your equation while you’re typing it. Obsidian is not a good example, it’s true that at least it keeps other inline equations in the same block rendered, but it doesn’t preview the equation that’s currently being edited, which is arguably the most important one to preview in its rendered state (for that you need to install the LaTeX Suite plugin). Better examples are Notion and Capacities.