A minor point, but your attributes for JSON data are not legal.
Code:
<td>reMarkable 2</td><td data-json_values={"permalink":"","image_thumb":"https:\/\/comparisontabl.es\/wp-content\/uploads\/remarkable-2-300x300.jpg","image_full":"https:\/\/comparisontabl.es\/wp-content\/uploads\/remarkable-2.jpg","alt_text":"remarkable-2"}>
Enclose them in single quotes. I don't think forward slashes need to be escaped.
Code:
<td>reMarkable 2</td><td data-json_values='{"permalink":"","image_thumb":"https://comparisontabl.es/wp-content/uploads/remarkable-2-300x300.jpg","image_full":"https://comparisontabl.es/wp-content/uploads/remarkable-2.jpg","alt_text":"remarkable-2"}'>
Also, relative links would save a lot of space.