Nope. But I’m pretty sure a long text field containing a markdown table will render in a script extension as a table.
Using this notation, you can read that from a script extension and simply output the text using
output.markdown(<longTextField>), and it will render in the sidebar as a nice-looking table. If this approach is practical for your use case, you could also add a button field which would launch your script extension and display the table.
| Syntax | Description |
| ----------- | ----------- |
| Header | Title |
| Paragraph | Text |