Expand and collapse rows in a table on Wordpress

There's table with rows, at the end of each row there must be "+" button. With + button clicked, another mini-table should be opened and can be closed with a - button. Buttons should look nice. The website where this development will be applied runs on Wordpress and your work should not have an effect on site speed, load time or any other malfunction. We have WP Rocket plugin that wraps, optimizes js files so you need to figure out a way to get this done. Please provide the js code and a sample HTML table so I can test it on a page and let you know it works or not.