Hi, this is a markdown limitation, unfortunately, and not something that Deepdwn can fix.
While some flavors of markdown (including Deepdwn’s) support checkboxes, they’re limited to ordered and unordered lists.
To my knowledge, there aren’t any Markdown formats that support checkboxes in tables.
You probably have some other options, depending on your goals though. You could create a “Done” column, and add a y/n as appropriate.
Or you could use the “standard” checkbox syntax in the editor ([x]) and just ignore the preview output, where it won’t be treated as a checkbox.
Lastly, if the preview is more important to you than actually editing, you could use html within your table directly (<input type="checkbox">). To toggle the checkbox, you’d then need to add the checked attribute to it. This will be rendered as a checkbox within the preview, but will not have any two-way syncing back to the editor.
[edit] You could also use emojis: ⬜ and ✅, which would work well in both the editor and preview.
Sorry that I don’t have better news for you