[pflanze]

Pandoc also supports[1] pretty featureful ways to declare tables, may be worth looking into.

[1] https://pandoc.org/MANUAL.html#tables

[diarmuid_glynn]

Pandoc tables remind me of the reStructuredText tables, which I used back in the day: https://docutils.sourceforge.io/docs/user/rst/quickref.html#...

Very powerful, but I found it challenging to remember the syntax since I was only using them intermittently. Still, it could indeed form the basis of a more advanced spreadsheet markup syntax, supporting things like merged cells (which Sheet Markup does not, and probably never will, support).