Just my two cents.
In this long form node, it need to allow standard markdown, as well as latex equations, code blocks, and an support for mermaid (diagram markdown, https://mermaid.js.org/intro/). Similar to what TiddlyWiki + plugins (https://tiddlywiki.com/) does.
For me, this is important if I am to move to Tana as my electronic journal/workbook
I've just been trying to find a work around for diagrams and came to this site to search if anyone had suggested mermaid support - definitely would help with my workflow and project planning (gannt and flow diagrams are a must!)