Wendy
 
To my knowledge there is still no widely accepted syntax for table caption in Markdown. Pandoc uses the following syntax:
| Right | Left | Default | Center |
|------:|:-----|---------|:------:|
|   12  |  12  |    12   |    12  |
|  123  |  123 |   123   |   123  |
|    1  |    1 |     1   |     1  |
: Table caption
MultiMarkdown uses this:
| Right | Left | Default | Center |
|------:|:-----|---------|:------:|
|   12  |  12  |    12   |    12  |
|  123  |  123 |   123   |   123  |
|    1  |    1 |     1   |     1  |
[Table caption]
And other Markdown flavors like GFM have no dedicated syntax at all. I personally would vote for adoption of the Pandoc syntax in JotterPad.