JAmp ships as enabled for the native Joomla! article view. As a rule of thumb the Google AMP format should be used for news-like pages, however JAmp is able to generate the AMP version of pages of your website for every component and view installed.
As an example, if you want to enable JAmp for the K2 articles it's enough that you select the K2 'Item' view in the dropdown as visible below:
Pay attention that the dropdown is multi-select, so you can select/unselect multiple elements by pressing and holding down the CTRL button.