- Open the page
- click "Edit"
- go to a table cell in the rightmost column (might work with others as well, didn't test)
- enter A != B (see attached screenshot for example)
- click "Save & View"
- The text "A != B" in the table cell as text
- The text "A" in the cell, and a "ghost column" next to it with text "B" (see 2nd attached screenshot for example)