I'm not sure I would publish a chart of elements, unless there's really a strong interest for it. In the meantime, one option is to check the plugin CSS file, which contains all the elements: plugin-yesyoukan/src/style/main.css at master · joplin/plugin-yesyoukan · GitHub (In there, a "stack" is basically a column)
Yes I'll add support for something like this. I'm still not sure what form it will take - I think I'd still want a central Markdown note that represent a board, and the linked notes would be cards.
No problem, and hopefully some other times then!