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Jaap is open to it but it's lower priority. It's been an open issue for years https://github.com/zim-desktop-wiki/zim-desktop-wiki/issues/...

Do you have by chance an idea how the rich-content plugins might work with markdown?

Tables could just be HTML, but stuff like Gnuplot diagrams or GraphViz graphs need to store their input data aswell as the actual rendered image.

Check out https://obsidian.md/ if you haven't already.

Seconding Obsidian. I started using it recently (admittedly for TTRPG notes) and I really like it! I haven't done a lot of cross-linking but it seems to work really well!

Even better, it stores everything in plain Markdown files in a folder hierarchy, so you can easily back everything up and/or interact with them outside the app if need be.

Even EVEN better, they have mobile apps that are perfectly happy to let you use your own file-syncing mechanism if you want to (although they do offer a sync service of their own as well.) Once I got it set up, everything Just Worked.