Markdown tables are easy to get the hang of, all you have to do is separate the columns using a vertical line,  |   and the rows are just new lines. However you have to have a title for example column and then a line delimiting the number of columns you would like to have using  ---  , like the following:

Star Wars | Lord of the Rings
--- | ---
Brilliant Sci-Fi Classic | Awe inspiring cult series
9 out of 10 | 10 out of 10

And here is it working in Supernotes:

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